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Author Topic: A Guide for the Centura, of sorts...  (Read 42200 times)

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A Guide for the Centura, of sorts...

« on: May 07, 2015, 03:55:13 PM »
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  • Lael

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    A GUIDE FOR THE CENTURA, of sorts . . . . . .
       



    We (serfassmike and I) were asked by one of the AA51 staff members to write a post on the various methods, settings, tweaks, apps, etc., that we found helpful to make our Centuras run nice and smooth.  These may or may not work for you depending on how you use your Centura.  As they say, your mileage may very.  Everyone's experience may differ.  These tweaks come from a variety of sources, mostly from me reading and reading (learning from people way smarter than I am), playing around with settings, and seeing what seems to work best.  The scripts used in the Nitro X mod developed by k1ks over at XDA were also helpful in learning and seeing what settings work best.  I am not an expert on these matters by any means.  I'm just a normal user trying to make the Centura run as smooth as it can.  NEITHER AA51, ORIGINAL POSTERS, serfassmike, OR I ARE RESPONSIBLE FOR ANYTHING NEGATIVE THAT MAY HAPPEN TO YOUR PHONE.  USE THIS INFORMATION AT YOUR OWN RISK. 

    While at it, I decided to add some download links for the Centura.  I remember someone (Thanks Keng) suggesting in the "interest or not" thread that it would be nice to have all the downloads in one place and I thought that was a good idea so that's what I'm attempting to do here.  Before doing anything, read the threads and make sure whatever you are flashing/changing/whatever is compatible with your current setup.  And always make a nandroid backup. NEITHER AA51, ORIGINAL POSTERS, serfassmike, OR I ARE RESPONSIBLE FOR ANYTHING NEGATIVE THAT MAY HAPPEN TO YOUR PHONE.  USE THESE DOWNLOADS AND TWEAKS AT YOUR OWN RISK. (Helpful Hint: This applies to any thread on any forum on the internet.  Whenever you are unsure about the risks, before flashing/changing the file system/etc, do a search of the thread with the keywords "brick", "bricked", or "bootloop".  The results will indicate whether people are having major problems and you can then weigh the risks associated with it.  It will also often lead you to the causes and possible solutions to the problems.  I do this regularly before flashing stuff, but then again I'm a little paranoid).

    Any additions, suggestions, mistakes I've made, corrections, or constructive criticisms are welcome.

    If you have any "how to" questions, I recommend to first look through all the relevant Centura threads as most answers can already be found there, and if you can't find an answer to then post a question to the general Centura forum, a relevant Centura thread, or this thread.  I have found the people at AA51 to be very helpful in helping people out.  And they are very good at what they do.

    Thank you to AA51, Team Centura, daddy366 for your support, serfassmike for the swap kernel section, and all the developers, themers, beta testers, and anyone else for working so hard to make this phone the little engine that could.

    My current setup:
       Tracfone
       Rom- Stock MJ1 Deodexed Zipaligned (Customized)
       Kernel- Zram 1.2 GHz
       Mod- Nitro X Spark 2.7 Prime (by k1ks over at XDA)
       Theme- Official Area Rom Green v.2
       Boot Animation- Cheshire cat coming out of the moon (with Bogie saying ”Of all the gin joints in all the towns in all the world, she walks into mine”)


    Table of Contents

    1. Rooting, Recovery, and Rom Flashing Guides
    2. Available Roms, Kernels, Recoveries, Themes, Boot Animations, Mods & Miscellaneous Items
    3. Non-Area App Recommendations
    4. Kernel and Other Performance-Based Tweaks
    5. Miscellaneous Build.prop Tweaks
    6. Using the Swap and Zram Kernels
    7. Init.d Support/Scripts/Mods
    8. How To: Section
    (Coming in the future...)
    9. Centura Specifications Sheet

    I have tried to supply as many links as I can but no doubt some are missing... I've put the Original Poster in parentheses.  Its hard to keep up with who created what so if I omitted any contributors, accept my apologies and let me know so I can update the OP.  Non-Area Roms are not included in this list.  LINKS ARE IN TEAL.


    1. Rooting, Recovery and Rom Flashing Guides

        Steps (Follow all directions in the links below carefully!)
        1. Install Custom Recovery
        2. Make a backup
        3. Root (or flash a custom rom that is already rooted and skip to Step 5)
        4. Flash a custom rom
        5. Experience the Magic!!!
       
        You are not allowed to view links. Register or Login (Thanks to DroidHost, daddy366, PureEvil, et al.) (How to install custom recovery and roms)
       
        You are not allowed to view links. Register or Login (Thanks to rfburns) (Attachment in OP) (How to install custom recovery and roms)

        You are not allowed to view links. Register or Login (Motorhead, kingmt01 and daddy366) (How to root without a custom rom)

        *All the custom roms come pre-rooted

    WARNING: It is not recommended to root the Centura using the Poot method.  This method does not fully root the Centura and has caused many problems for users.  If you have already rooted using the Poot method, I would suggest you unroot and then reroot using AA51's method, either by using the root method explained above or by installing one of the custom roms.

    2. Available Roms, Kernels, Recoveries, Themes, Boot Animations, Mods & Miscellaneous Items

       
       A) Roms

          You are not allowed to view links. Register or Login

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          You are not allowed to view links. Register or Login
          
          You are not allowed to view links. Register or Login

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          You are not allowed to view links. Register or Login (daddy366)

          You are not allowed to view links. Register or Login (daddy366)

          You are not allowed to view links. Register or Login (daddy366, kingmt01, Motorhead, DroidHost, Spawn & Chr|s)

          You are not allowed to view links. Register or Login (daddy366)

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          (daishi4u)

          ARC=AreaRom Centura Roms
          TC=TeamCentura Roms


       B) Kernels and Related Items

          You are not allowed to view links. Register or Login (daddy366)

          You are not allowed to view links. Register or Login (daishi4u)

          You are not allowed to view links. Register or Login (daishi4u)

          You are not allowed to view links. Register or Login (NEW) (daddy366)

          You are not allowed to view links. Register or Login (NEW) (daddy366) (This kernel has both swap and zram support)

          You are not allowed to view links. Register or Login (daishi4u)

         You are not allowed to view links. Register or Login (daishi4u)

       C) Recoveries

          You are not allowed to view links. Register or Login (daishi4u)

          You are not allowed to view links. Register or Login (Viper) (Motorhead)

          You are not allowed to view links. Register or Login (daddy366)

          You are not allowed to view links. Register or Login (DroidHost)

          You are not allowed to view links. Register or Login (daddy366)

         You are not allowed to view links. Register or Login (VIP Only) (daddy366)

          You are not allowed to view links. Register or Login (VIP Only) (daddy366)

       D) Themes

          You are not allowed to view links. Register or Login (alwazeplayin)

          You are not allowed to view links. Register or Login (alwazeplayin)

          You are not allowed to view links. Register or Login (ufo8mymunky)

          You are not allowed to view links. Register or Login (VIP Only) (alwazeplayin)

       E) Boot Animations

          You are not allowed to view links. Register or Login (alwazeplayin)

          You are not allowed to view links. Register or Login (daddy366)

          You are not allowed to view links. Register or Login (Reply #1)

          You are not allowed to view links. Register or Login (serfassmike)
              serfassmike is currently taking requests for boot animations.  He can make them from any 3gp or mp4 videos.  Anybody who has a request can send him a personal message.

          You are not allowed to view links. Register or Login (ARC 1.2???) (Reply #1)- This is the Cheshire cat coming out of the moon

          You are not allowed to view links. Register or Login (daishi4u & daddy366) (Reply #12)- This zip allows you to use the custom boot animations if you still have the stock tracfone  animation
          
        F) Mods

          You are not allowed to view links. Register or Login (ufo8mymunky)

        G) Miscellaneous

          You are not allowed to view links. Register or Login (TotesMyGoats) (Download link in Reply #7)

          You are not allowed to view links. Register or Login (RICK_Galaxy_Proclaim) (ARC 1.2)

          You are not allowed to view links. Register or Login (Reply #2)

    3. Non-Area App Recommendations

    These are just some of the apps I have found useful in tweaking/customizing and that play nice with the Centura.  Most of you know all about these, but this list may be helpful for newer users.  I know there are a lot more useful apps and mods out there, but this list isn't meant to be exhaustive.  Its just meant to get newer users started.  Some, if not most, require root.

    WARNING: It is not recommended to use Rom Manager (not listed below) because it has been known to hard brick the Centura.


    Xposed Framework- These links below help explain how to install on Centura.  Basically you need 2 apps: Xposed Installer Static BusyBox and Xposed Installer APK.   

         Steps to Install Xposed Framework (Thanks to daddy366 for the instructions)   
         
         1. You are not allowed to view links. Register or Login Xposed Installer Static BusyBox

         2.You are not allowed to view links. Register or Login Xposed Installer APK

         3. Install both as system apps and reboot (See Reply # 3 in You are not allowed to view links. Register or Login if you need instructions) 

         4. Open Xposed Installer APK, click on Framework, then Installation Mode, and use Classical to install, then let it reboot and you're good to go and can  install Xposed Mods:

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         Note
              When you install the Xposed Installer APK, it will automatically place a "Xposed-Disabler-Recovery.zip" on your external SD card.  In case of a boot  loop you can flash this.  It copies /system/bin/app_process.orig back to  /system/bin/app_process

        Informative LInks
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          Xposed Modules
             APM+
             App Settings
             Enable Camera on Lockscreen
             Fake ID fix
             Master Key multi-fix
             No Increasing Ringtone
             Notification Mod
             Recent App Cleaner
             Ringer & Notification Volume Unlink in ICS/JB/KK/L
             Secure Settings (Xposed Enhancements for Tasker)
             Shaky
             Xblast Tools
             XHaloFloatingWindow
             XPrivacy         
             

          To Customize Look and Feel
             Force Fast Scroll
             LiveIcons
             NotifyClean
             Play Store Changelog
             Smooth System Progress Bars
             Tinted Status Bar
             XBatteryThemer
             XToast
             iFont
             Xblast Tools


             You are not allowed to view links. Register or Login

    Other Apps

    You are not allowed to view links. Register or Login This is one of the main apps I use to tweak build.prop, sys.ctl, Entropy, FS Trimmer, read-ahead cache size, OOM manager, I/O scheduler, governor, crystallize apps (hibernate) and much more...
                
    You are not allowed to view links. Register or Login I use this to disable some services, mostly some of the 304 Google Play “subservices”, that I don't need running in the background using up precious memory.  I use it in conjunction with 3C Toolbox, which can disable services as well as receivers, providers, activities, and can deny permissions apps request (Some google play "subservices" require their receiver to be disabled as well to prevent them from re enabling).
         
    You are not allowed to view links. Register or Login Good file manager

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    Tasker- To automate your Centura

    You are not allowed to view links. Register or Login Plugin for Tasker

    You are not allowed to view links. Register or Login To save space on your internal storage
          
    You are not allowed to view links. Register or Login
          
    You are not allowed to view links. Register or Login Change to a faster DNS server
          
    If you want to find the fastest server in your area, you can use the You are not allowed to view links. Register or Login program on your computer.  It takes a while (maybe up to 20 min), but its thorough
          
    You are not allowed to view links. Register or Login Gives you init.d support to run scripts if you're running a rom or kernel that doesn't have init.d support.
         
    *If you use Uni-init v1.0, read Post #4 in the thread about a false-positive CWM might warn you about before using.
          
    You are not allowed to view links. Register or Login Another app that gives init.d support
             
    You are not allowed to view links. Register or Login Excellent audio mod (There may be a compatibility problem with version FX 2.3.4.0, but version FX 2.3.3.0 works fine on the Centura.  Still checking into version FX 2.3.4.0) 
          
         You are not allowed to view links. Register or Login

    You are not allowed to view links. Register or Login Unlinks ringer and notification volumes as well as adds the ability to adjust system and voice call volumes
          
    You are not allowed to view links. Register or Login We all know about the time problems on our Centuras.  Most people seem to use You are not allowed to view links. Register or Login but I prefer Smart Time Sync because it has the additional option to use GPS to sync your time if you're not connected to the internet. 
          
    You are not allowed to view links. Register or Login You can use this to adjust settings or check zram status when using the Zram kernel

         Note- I don't think the "Enable Zram" option in this app will work with our Zram kernel because I believe the script overrides this function, but I could be wrong.  Furthermore, I talked to the developer and he said he considers the app deprecated or obsolete to many devices and has discontinued development)

    You are not allowed to view links. Register or Login Lists all partitions and mount points on your device as well as total and free RAM and Zram, among other information

    You are not allowed to view links. Register or Login Google Now/Siri/Google Voice Search-like app, still in beta at the time of this writing, but works well

         You are not allowed to view links. Register or Login

    Triangle Away (By Chainfire)- This allows you to remove the yellow triangle and reset the flash counter so you can restore your phone to stock with no traces of it being modified in case you need to return it.  WARNING: Although several Centura users have reported that this has worked successfully on the Centura, it can still be a dangerous method so read up and do your due diligence.  I have posted some links below to the developer's thread and to some AA51 member's experiences.   

    You are not allowed to view links. Register or Login
    You are not allowed to view links. Register or Login (Starts at Reply #82)
    You are not allowed to view links. Register or Login
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    4. Kernel and Other Performance-Based Tweaks

    These are some of the tweaks/settings I use or have used that I've found make the Centura run fast, smooth, and stable.  Some, if not most, are not battery friendly.  Most of the tweaks come from doing a lot of research and reading (learning from people smarter than I am), and then playing around with the settings.  Some of the tweaks come from the Nitro X mod or modifications thereof.  You can use 3C Toolbox, Nitro X mod, or Xblast (or any app of your choosing) to achieve these settings, or do it manually.  Remember, these remarks are based solely on my experience.  Results all depend on how you use your phone and how your individual phone reacts to the tweaks/settings.  May need to be rooted to use some of the tweaks.

    *If you use 3C Toolbox to tweak the settings, 1st go to System Manger>One-click>Create CWM/TWRP restore.  This will create a CWM/TWRP restore package of your original settings so you can restore them if needed.

    Combined Tweaks/Settings (All-in-One)

    Instead of listing tweaks for individual settings, here I've listed a "complete" list of certain tweaks that work well with each other.  This is based on my own personal experience with the Centura.  The individual tweaks section follows this section.

    The settings below are preliminary and subject to change after further testing/This section is still under construction

                                                                               A                                       B                                       C                                       D                   
    __________________________________________________________________________________________________________________________________________________
    Kernel                                                             OC                                    OC                             OC or Stock                         Stock
    __________________________________________________________________________________________________________________________________________________
    Governor                                               Ondemand                     Interactive                       Interactive                     Ondemand
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         min. Freq. Speed                                   600                                    480                                    320                                    196
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         go_hispeed_load                                   N/A                                     70                                       85                                     N/A
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         min_sample_time                                 N/A                                  80000                                20000                                  N/A
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
          timer_rate                                             N/A                                  10000                                30000                                  N/A
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         up_threshold                                         60                                      N/A                                    N/A                                      95
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         sampling_rate                                    50000                                   N/A                                    N/A                                  120000
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         sampling_down_factor                          3                                       N/A                                    N/A                                       1
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         down_differential                                 15                                       N/A                                    N/A                                       5
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
          freq_step                                                50                                       N/A                                    N/A                                      10


    __________________________________________________________________________________________________________________________________________________
    I/O Scheduler                                        Deadline                            Deadline                                CFQ                                   NOOP
    __________________________________________________________________________________________________________________________________________________
    Read Ahead Cache Size                 
    __________________________________________________________________________________________________________________________________________________
    Dalvik Heap Size                                       128                                      128                                        72                                        64
    __________________________________________________________________________________________________________________________________________________
    OOM/Minfree Settings
                                 
         Empty Applications                             120                                        64                                        72                                        43
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         Content Providers                                 80                                        48                                        56                                        36
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         Hidden Applications                              48                                        32                                        48                                        31
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         Secondary Server                                  24                                         16                                        24                                        23
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         Visible Applications                               18                                          8                                        16                                        18
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         Foreground Applications                        6                                          4                                        10                                        13
    ___________________________________________________________________________________________________________________________________________________
    VM/SysCtl Settings

         vm.min_free_kybtes                             4096                                    4096                                  4096                                    2580
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.oom_kill_allocating_task                   0                                           0                                         0                                          0
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.dirty_background_ratio                   10                                         70                                        5                                          5
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.dirty_ratio                                          90                                         85                                      10                                         20
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.vfs_cache_pressure                          50                                         15                                       70                                      100
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.swappiness                                        20                                         80                                       30                                        60
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.drop_caches                                        0                                           0                                         0                                          0
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.dirty_expire_centisecs                     
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         vm.dirty_writeback_centisecs               
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


    ___________________________________________________________________________________________________________________________________________________
    AnTuTu Benchmark Score
    ___________________________________________________________________________________________________________________________________________________


    A=Performance
    B=Multitasking
    C=Balance Performance/Battery Life
    D=Average Performance/Good Battery Life


    Individual Tweaks

       Governor Settings (For Performance)

          Interactive Governor (My Preference)
             Min Frequency=480 (snappier but will use more battery)
             Max Frequency=1200 (or the max frequency for whatever kernel you are using)
             go_hispeed_load=70
             hispeed_freq=1300000 (Whatever your kernel's max. frequency is)
             min_sample_time=80000
             timer_rate=10000

          Ondemand Governor
             up_threshold=70
             sampling_rate=50000
             sampling_down_factor=3
             down_differential=15
             freq_step=50

    From my own personal experience, I've found that Interactive seems to be quicker, but I find Ondemand faster overall and I get better Antutu scores with Ondemand.  I liken it to this: If I were running a sprint, I would use Interactive.  If I were running a longer distance race, I would use Ondemand.  I've found SmartassV2 to also be very good.

    Recommended Governors For a Single-Core CPU (from gsstudios over at XDA; see link below)

    Performance:
    1. Interactive
    2. SmartassV2
    3. Performance

    Battery Life:
    1. Ondemand
    2. Powersave and Conservative

    Balanced Power Saving and Performance:
    1. Interactive and Ondemand (Stock)
    2. SmartassV2

    Gaming:
    1. Interactive
    2. Performance, Ondemand and SmartassV2

    * Governors not supported by our kernels are omitted

    Note: I've found Antutu scores to be very fickle.  I can run 3 tests back-to-back-to-back and get around 5000, 5400, and 4700, respectively.  I can also reboot after each test and still get the same varied results, so I don't put much stock in Antutu scores.

    You are not allowed to view links. Register or Login is a good comprehensive discussion of governors and schedulers
       
       I/O Scheduler
          
        Deadline (My 1st Preference)- I've found this best for performance but can become unstable under heavy workload at times
          
        CFQ- (My 2nd Preference) I've found it to have moderate to good performance, I think because its so stable.  I believe this is the stock default scheduler. 
          
        NOOP- I've found it to have moderate performance and stability

        SIO- Seems a little slow to me, but stable and reliable, with good battery life

    Recommend I/O Schedulers (from gsstudios over at XDA; see link above)

    Everyday Usage:
    1. SIO
    2. NOOP, CFQ, and Deadline

    Battery Life:
    1. NOOP
    2. SIO

    Gaming:
    1. SIO
    2. Deadline and CFQ

    Performance (benchmarking):
    1. Deadline
    2. NOOP and SIO

    Heavy Multitasking:
    1. CFQ
    2. Deadline

    *Schedulers not supported by our kernels have been omitted

       Read Ahead Cache Size
          
        128kb (My Preference)
       
    I know this goes against conventional wisdom.  I've tried the others: 1024, 2048, 3072, and 4096, but from my experience, 128 works the fastest when I actually use my phone.  When I ran some benchmark tests, 3072 seemed to be the best, but like I said, when actually using my phone, 128 produces the best speed and lowest lag for me.  Most of the AA51 custom roms are set at 4096.  Some users have reported 2048 works best for them.
       
       Dalvik.vm.heapstartsize
          5mb

       Dalvik.vm heapgrowthlimit
          36mb

       Dalvik.vm.heapsize

    Basically, this sets the maximum heap size before an application is forced to run garbage collection, which uses up CPU cycles and slows down your phone.  Increasing this number will allow an application to use more memory if it calls for it, and garbage collect less frequently.  Lowering the number will use less memory but the app will go into garbage collection quicker, making the app less efficient.  The best setting really depends on how you use your phone and whether you are running apps that use a lot of memory.  If you use memory intensive apps, a higher setting may work better.  If you use less memory intensive apps, a lower setting may work better.  Its best to play around with this setting and see what works best for you.
          
        128mb- (My 1st preference) I don't find using this value eating up too much memory in conjunction with my other settings and I get really good performance.  Probably a good setting if you run memory intensive apps

        72mb- (My 2nd preference) This setting seems to work really well for the way I use my phone

        64mb- Seems to work well on the Centura (I believe this is the setting on most of the AA51 custom roms)

        48mb- Probably a good setting if you don't run memory intensive apps

        24mb- I believe this is the default setting for stock Centura      

       OOM/LMK/Minfree Settings

                                                                     A                 B                 C                 D                 E                  F                 G

    Empty Applications                          128             100             100              43               64                72              120
    Content Providers                              96               85               80               36               48                56               80
    Hidden Applications                           80               70               56               31               32                48               48
    Secondary Server                                56               55               36               23               16                24               24
    Visible Applications                             48               14               24               18                8                 16               18
    Foreground Applications                    40                8               12                13                4                 10                 6

    A=Very aggressive, fast apps but decreased multitasking performance, may kill several apps/processes running in background
    B=(3rd Preference) Aggressive, very good performance, but may kill some background apps/processes running in background
    C=Moderate, good performance, fewer background apps/processes killed
    D=Default values, average performance
    E=Good multitasking, slightly better performance than default, most apps/processes won't be killed
    F=(2nd Preference) A good combination of performance while keeping apps/processes in background from being killed, with good multitasking
    G= (1st Preference) Very fast while keeping most needed apps/processes running in background from being killed

    The best settings really depend on the way you use your phone.  Usually the less aggressive you go the better the multitasking performance will be and fewer background apps/services/processes will be killed.  The more aggressive you go, the faster the apps will work, but multitasking won't be as good and more background apps/services/processes will be killed.  Its really a trial and error thing to see what works best for you.
          
       VM/SysCtl Tweaks

                                                                            A                  B                 C                 D                 E                 F                 G

    vm.min_free_kybtes                               4096           4096           4096            2580          4096
    vm.oom_kill_allocating_task                     0                0                  0                   0                 0
    vm.dirty_background_ratio                       2               10                70                  5                 5
    vm.dirty_ratio                                                1               80                95                 20              10
    vm.vfs_cache_pressure                            300              50                15                100             70
    vm.swappiness                                            20              20                80                  60              30
    vm.drop_caches                                            0                0                  3                     0                0
    vm.dirty_expire_centisecs                       700            700            700                200             700
    vm.dirty_writeback_centisecs                 500            500            500                500             500

    A=Best performance for gaming, but eats battery
    B=(My 1st Preference) Very good performance
    C=Good for multitasking
    D=Default values, average performance
    E=(My 2nd Preference) Very good performance

       *oom_kill_allocating_task- If this setting is disabled (set to 0), the OOM killer will scan through the entire task list to select a task to kill based on heuristics.  It normally selects a rogue memory-hogging task that frees up a large amount of memory.  But since it has to scan through the entire list, it is not efficient and may cause some lag.  If enabled (set to 1), it will kill the task that triggered the out-of-memory situation and avoids the expensive task list scan.  However, it could potentially kill the app you're using if that app is what caused the out-of-memory situation. 

       *If you don't use swap, swappiness setting is irrelevant.  For more information on swappiness, see the Swap/Zram section below.

       TCP Stack Tweaks for Better Performance
          I have read that tweaks for TCP Stack buffering using build.prop may be placebo. Whether this is true or not, I have no idea.  But it won't hurt anything.

          net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960
          net.tcp.buffersize.wifi=4096,87380,256960,4096,16384,256960
          net.tcp.buffersize.umts=4096,87380,256960,4096,16384,256960
          net.tcp.buffersize.gprs=4096,87380,256960,4096,16384,256960
          net.tcp.buffersize.edge=4096,87380,256960,4096,16384,256960

       3G/Network Tweaks for Faster Speeds

          I believe most of the custom roms/kernels from AA51 already come with similar tweaks, although I may be mistaken.  Anyhow, here are some that may help your speeds:

          ro.ril.enable.3g.prefix=1
          ro.ril.hep=1
          ro.ril.hsxpa=2
          ro.ril.enable.dtm-1
          ro.ril.gprsclass=12
          ro.ril.hsdpa.category=8
          ro.ril.enable.a53=1
          ro.ril.hsupa.category=5

       TCP Congestion Algorithms

    To be honest, I don't know a whole lot about this.  But from what I do understand, the algorithm strategies are aimed to avoid sending more data than the network is capable of transmitting, thus avoiding network congestion.  The 2 settings available on the Centura are "Cubic" and "Reno", as far as I know.  "Cubic" is the default.  I was able to find a couple of benchmarks tests some developers conducted (including Francisco Franco, developer of the Franco kernel) and it appears that "Reno" outperforms "Cubic" in the ping, download speeds and upload speeds categories.  Using 3C Toolbox, I changed between "Cubic" and "Reno" and ran some tests using Ookla Speedtest and it did seem that "Reno" did have slightly faster download and upload speeds, and a lower ping value than "Cubic".  How this translates to real-life use, I'm not sure.  I'll have to leave my setting on "Reno" for a while and see if it seems to make a difference.

      Entropy
          This is a debated subject.  Some people believe that increasing your entropy, and thereby keeping a section of your file system full of random bits, helps reduce lag because the system doesn't have to wait for the file system to generate them. Others believe that this is just a placebo effect.  Either way, it can't hurt.  You can increase your entropy by using the 3C Toolbox app or the Nitro X mod.  There are plenty of other scripts out there that do this, but I haven't used them.

       Nice Value
          If you have an app/process that keeps getting killed because of low memory, you may be able to prevent that app/process from being killed less frequently by lower its nice value, thus giving it a higher CPU and IO scheduling priority. The lower the nice value, the higher the priority the app/process is given.  I've used 3C Toolbox to raise the priority (lower the niceness) of the Smart Time Sync app I'm using to prevent it from being killed with some success.   

    5. Miscellaneous Build.prop Tweaks

    I plan on adding a lot more to this section when I have more time, probably in August sometime...

       -If you want to add a navigation bar to your Centura if it doesn't have one, add this to build.prop
          qemu.hw.mainkeys=0
                    (You can modify the color, size, and icons with Xblast Tools)
                   
       -To make your proximity sensor work faster, add/modify this in build.prop
          mot.proximity.delay=10
       

    6. Using the Swap and Zram Kernels

    Swap Kernel

         There are currently 2 ways to use the swap kernel.  1 method is to use a swap file on the internal sd card and the other is to create a swap partition on your ext sd card:

         Using Swap File on Internal SD Card

         Courtesy of serfassmike:

         Well im no expert, nor do i claim to be, im just going to share what i have learned.
    Right now my ram is hovering anywhere between 160mb free to over 200 mb free at times
    depending on workload. Im running daddy366 custom swap kernel which is overclocked to
    1.2ghz, and also using minfree manager app from the playstore. There is no cost for this app
    or for the custom kernel. Just search for centura swap kernel zip and flash it through clockwork
    mod recovery, or team win recovery project (twrp) recovery. Not sure if there is an odin flashable tar
    file for the swap kernel or not. But anyways, after flashing swap kernel, google search and download
    defiant07 swapiton script. Download terminal emulator, free from playstore. Open terminal
    Emulator and type su , press enter, then type swapiton and press enter, this will run the script
    just follow the prompts and say no to everything except change the swapiness to 50.
    Also when it asks where to make the swapfile, choose /data partition which is the internal
    phone storage. Dont worry this will not delete any data, it will just reduce your internal storage
    by however many mb you chose for the size of the swapfile.

         Using Swap File or Swap Partition on your External SD Card

         See You are not allowed to view links. Register or Login for instructions 

         Also see You are not allowed to view links. Register or Login for more information

        Comments

         Just a cautionary remark for users who plan on using swap.  From the reading up I've been doing on swap, if you set up your swap file on your internal sd (/data), there is a slight risk that bad blocks could build up in your nand memory and once that happens that space is gone forever, as I understand it.  Using swap on your external sd card may be safer for your phone, but the lifespan of your external sd card will most likely be shortened and performance will take a hit since external sd cards are slower than internal memory.  The trade off is that you can always buy a new external sd card, while phones are much more expensive.

    Zram Kernel and Script

         This kernel has both swap and zram support

         What is Zram?

         Zram is an alternative to swap.  It basically compresses memory pages and puts them in your allocated area in the fixed RAM rather than on the disk like swap does.  Its like a swap in memory rather than on the external or internal sd card.  It is really only useful on low memory devices (512 mb or less) such as the Centura. 

         The advantages of zram is that it will free up more memory because the pages are compressed in the fixed RAM area.  And because it stores the pages in RAM rather then on the external or internal sd card, the retrieval of the data is faster since RAM is faster than using disks.  This should lead to faster multitasking.  And it should increase the responsiveness and overall performance of your phone.  I say should because the compression of data comes at an expense.  During compression and decompression, the CPU has to work harder with increased cycles and that in turn may negate any increased performance gained by using RAM instead of disk to swap pages.  Furthermore, the increase in CPU cycles may lead to more of a drain on the battery.  However, on devices with low memory such as ours, the negatives will probably be at a minimum as long as you don't set your swappiness level to aggressively.

         In short, it should give you faster multitasking and will increase your free RAM, thus leading to less background apps/processes being killed due to low memory.  It also should give a better overall performance of your phone (as long as swappiness is not set too aggressively), but will probably drain your battery a little faster.

         It also must be noted that when using zram it is the unneeded RAM data that is compressed.  Since there is no way to actually increase the physical RAM on our devices, zram takes a portion of the actual RAM and compresses it.  Therefore, as an example, it you have allocated 64mb to zram and have a compression ratio around 2.5:1, zram will take around 25mb of RAM to compress into 64mb of zram.  Bottom line is that the app you are currently using will have 25mb less RAM to use and that is why you might see less available RAM in any app you use to check how much RAM you have, even though you actually have more usable RAM overall.  Hope that makes sense.

         It also seems to me than zram may be a better alternative than swap, not just because of the faster speed of RAM over disks, but because you don't have to worry about wearing down your external sd card prematurely or building up bad blocks on your internal card, but that's just my less than genius opinion.

         To Enable and Disable Zram

         To enable, just flash the kernel and script in recovery.  To disable, go into your init.d folder and find "60ZRAM".  Add ".txt" to the end of the name (60ZRAM.txt) and reboot.  To re-enable, just remove the ".txt" and reboot.  This script sets aside 50mb for your zram.  You can go into the script and change the size if you want.  There are also a few apps out there, including Zram Settings Free, that you can use to change some settings and view your zram status.  You can also go into terminal emulator and type  cat /proc/swaps  to see if it is enabled.  Furthermore, you can use the app DiskInfo to view total and free RAM and Zram (see app section for link).

    Note- I don't believe the "Enable Zram" function in the Zram Settings Free app will work to turn on and off zram with our kernel because the script we use overrides this function, but I could be wrong.  Furthermore, the developer of this app told me he considers it to be deprecated or obsolete on many devices and has discontinued development.

        How to Change the Size of Your Zram Space

              1. Go into your init.d folder and find the "60ZRAM" file
              2. Find the line that says "echo $((50*1024*1024)) > /sys/"
              3. The number in green above is your zram size (in MB), so you just change that number

               It is suggested that you do not go over 25% of total ram, which in our case would be 128mb.  Anything more will create a compression rate that is too high and your phone will actually slow down.  Most people can get by with a lot less and should use a lower size.  I have read that 18% of total ram (about 72mb) is a good setting.  The lesser you can go, the better.  I am currently using 64mb and its working quite well.  The default setting of 50mb would probably be optimum unless you find your zram space getting filled close to this limit, then you can raise it accordingly.  You can check how much of the zram space you are using up with the DiskInfo or Zram Settings Free app.           

         Settings

              Swappiness- The tendency of the kernel to move memory (real RAM) to the swap/zram allocated area.  The higher the swappiness, the more RAM there will be.  However, the latency will also be higher so operations will not be as smooth and the CPU may have to work harder.  Conversely, the lower the swappiness, the fewer RAM you will have but the latency will also be low, which will result in smoother operations, and the CPU won't have to work as hard.  The default setting is 60 (this is in the form of percentage). 

              So far, I am finding that a setting of 20-30 with a non-aggressive minfree setting seems to work best for the way I use my phone.  I don't usually use any memory-intensive apps too often, but if I did I might want to set it between 40-60 and increase my minfree settings. 

         After I do some playing around with swappiness and other vm values, I'll report back more observations

    7. Init.d Support/Scripts/Mods

    Most of the custom roms from AA51, if not all, and some of the kernels already come with init.d support built-in so you can run scripts.  However, if you are using a rom and kernel that do not have init.d support, you can use one of the two apps mentioned in the app section to get init.d support (Uni-init v.1.0 or Universal init.d).
       
       *If you use Uni-init v1.0, read Post #4 in the thread about a false-positive CWM might warn you about before using.

    Scripts/Mods

    *Please read the OP and threads of these before trying any of these, make a nandroid backup, and do your due diligence.  AGAIN, NEITHER AA51, ORIGINAL POSTERS, serfassmike, OR I ARE RESPONSIBLE FOR ANYTHING NEGATIVE THAT MAY HAPPEN TO YOUR PHONE.  USE AT YOUR OWN RISK.

    You are not allowed to view links. Register or Login This mod from xda developer k1ks works really well on the Centura.  I've noticed an overall improvement in speed and smoothness when using this mod.  When I don't feel like adjusting/playing with some of my settings manually, I just use this, or in conjunction with the manual tweaks.
          
    You are not allowed to view links. Register or Login I've noticed some people in this forum have tried this with success, but I haven't yet so I can't comment on it.  I do plan on trying it very soon and will let you know my thoughts

    You are not allowed to view links. Register or Login


    I plan on testing more mods/scripts in the future and will report back when I do...

    8. How To: Section

    This will be coming later...


    9. Centura Specifications Sheet (From pdadb.net)

    Detailed Technical Datasheet of Samsung SCH-S738C Galaxy Centura

    Brand:   Samsung
    Browse Samsung devices
    Manufacturer:   Samsung Electronics
    Hardware Designer:   Samsung Electronics
    Release Date:   May, 2013

    Physical Attributes
    Dimensions
    (width x height x depth):   61 x 113 x 11.43 millimetres
    2.4 x 4.4 x 0.5 inches
    Bounding Volume:   78.8 cubecentimetres
    Mass:   125 grams (battery included)

    Software Environment
    Embedded Operating System:   Google Android 4.0.4
    Kernel:   Linux

    Microprocessor, Chipset
    CPU Clock:   800 MHz
    CPU:   Qualcomm MSM7625A
    Width of Machine Word:   32 bit
    CPU Core:   ARM Cortex-A5
    Instruction Set:   ARMv7-A

    Memory, Storage capacity
    RAM type:   LPDDR2 SDRAM
    RAM capacity:   512 MiB
    ROM type:   Flash EEPROM
    ROM capacity:   3814 MiB
    ROM capacity in bytes:   4 GB (billion bytes)

    Graphical subsystem
    Display Type:   Supported
    Display Color Depth:   18 bit/pixel (262144 scales)
    Display Diagonal:   3.5 " (89 millimetres)
    Display Resolution:   320 x 480 (153600 pixels)
    Viewable Display Size:   1.94 " x 2.92 " (49.37 x 74.05 millimetres)
    Pixel density (dot pitch):   164.6 pixel/inch (0.15428 millimetre/pixel)
    Graphical Controller:   Qualcomm Adreno 200

    Audio Subsystem
    Audio Channel(s):   stereo sound
    Microphone(s):   mono sound
    Loudspeaker(s):   mono sound
    Audio Output:   3.5mm plug

    Cellular Phone
    Cellular Networks:   GSM850, GSM900, GSM1800, GSM1900
    Cellular Data Links:   GPRS, EDGE
    Cellular Antenna:   Internal antenna
    Call Alert:   64 -chord melody (polyphonic)
    Vibrating Alert:   Supported
    Speakerphone :   Supported
    Phone Controller:   Qualcomm MSM7625A
    SAR (head) 1:   1.39 W/kg
    SAR (body) 1:   0.92 W/kg

    Secondary Cellular Phone
    Dual Cellular Network Operation:   Single standby
    Secondary Cellular Networks:   CDMA800 (BC0), CDMA1900 (BC14)
    Secondary Cellular Data Links:   cdmaOne, CDMA2000 1xRTT, CDMA2000 1xEV-DO Rel. 0
    Secondary Cellular Antenna:   Internal antenna
    Secondary Phone Controller:   Qualcomm MSM7625A

    Control Peripherals
    Positioning Device:   Multi-touch screen
    Primary Keyboard:   Not supported
    Directional Pad:   Not supported
    Scroll Wheel:   Not supported

    Interfaces
    Expansion Interfaces:   microSD, microSDHC, TransFlash
    Supports High Capacity (SD 2.0/HC) memory cards with capacity of up to 32GB
    USB:   USB 2.0 client, Hi-Speed (480Mbit/s)
    USB Series Micro-B (Micro-USB) connector
    Bluetooth (802.15):   Bluetooth 3.0, Internal antenna
    Wireless LAN/Wi-Fi (802.11):   IEEE 802.11b, IEEE 802.11g, IEEE 802.11n
    Internal antenna
    Infrared Gate:   Not supported
    Multimedia Broadcast
    Analog Radio:   Not supported
    Digital Media Broadcast:   Not supported

    Satellite Navigation
    Built-in GPS module:   Supported
    GPS Protocol:   NMEA 0183
    GPS Antenna:   Internal antenna
    Complementary GPS Services:   Assisted GPS, Geotagging
    Navigation Chipset:   Qualcomm MSM7625A gpsOne

    Built-in Digital Camera
    Sensor Type:   CMOS sensor
    Resolution:   2048 x1536 pixels (3.15MP)
    Autofocus (AF):   Not supported
    Optical Zoom:   3 x
    Macro Mode:   Not supported
    Built-in Flash:   Not supported
    Camcorder:   320x480 pixels
    Recordable Image Formats:   JPG
    Recordable Video Formats:   3GP, 3G2, MPEG4

    Power Supply
    Battery Technology:   Lithium-ion battery
    Battery Layout:   removable
    Battery Capacity:   1500 mAh

    Additional Details
    Built-in accelerometer:   Supported
    Additional Features:   
    capacitive touchscreen
    digital compass
    HSDPA 7.2
    HSUPA 5.76
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    Re: A Guide for the Centura, of sorts...

    « Reply #1 on: May 07, 2015, 03:55:58 PM »
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    Reserved for a Cold Winter's Night




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    Re: A Guide for the Centura, of sorts...

    « Reply #2 on: May 07, 2015, 05:57:23 PM »
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    Looks good guys...im sure it will help a lot out....Thanks
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    Re: A Guide for the Centura, of sorts...

    « Reply #3 on: May 07, 2015, 11:36:36 PM »
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    Well im no expert, nor do i claim to be, im just going to share what i have learned.
    Right now my ram is hovering anywhere between 160mb free to over 200 mb free at times
    depending on workload. Im running daddy366 custom swap kernel which is overclocked to
    1.2ghz, and also using minfree manager app from the playstore. There is no cost for this app
    or for the custom kernel. Just search for centura swap kernel zip and flash it through clockwork
    mod recovery, or team win recovery project (twrp) recovery. Not sure if there is an odin flashable tar
    file for the swap kernel or not. But anyways, after flashing swap kernel, google search and download
    defiant07 swapiton script. Download terminal emulator, free from playstore. Open terminal
    Emulator and type su , press enter, then type swapiton and press enter, this will run the script
    just follow the prompts and say no to everything except change the swapiness to 50.
    Also when it asks where to make the swapfile, choose /data partition which is the internal
    phone storage. Dont worry this will not delete any data, it will just reduce your internal storage
    by however many mb you chose for the size of the swapfile.
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    Re: A Guide for the Centura, of sorts...

    « Reply #4 on: May 07, 2015, 11:46:37 PM »
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    Added to the OP.  Thanks!
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    Re: A Guide for the Centura, of sorts...

    « Reply #5 on: May 08, 2015, 12:08:49 AM »
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    Well im no expert, nor do i claim to be, im just going to share what i have learned.
    Right now my ram is hovering anywhere between 160mb free to over 200 mb free at times
    depending on workload. Im running daddy366 custom swap kernel which is overclocked to
    1.2ghz, and also using minfree manager app from the playstore. There is no cost for this app
    or for the custom kernel. Just search for centura swap kernel zip and flash it through clockwork
    mod recovery, or team win recovery project (twrp) recovery. Not sure if there is an odin flashable tar
    file for the swap kernel or not. But anyways, after flashing swap kernel, google search and download
    defiant07 swapiton script. Download terminal emulator, free from playstore. Open terminal
    Emulator and type su , press enter, then type swapiton and press enter, this will run the script
    just follow the prompts and say no to everything except change the swapiness to 50.
    Also when it asks where to make the swapfile, choose /data partition which is the internal
    phone storage. Dont worry this will not delete any data, it will just reduce your internal storage
    by however many mb you chose for the size of the swapfile.

    So the way you did it, you didn't need to partition anything, correct?
    And how many mb did you choose for your swapfile?
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    Re: A Guide for the Centura, of sorts...

    « Reply #6 on: May 08, 2015, 12:13:39 AM »
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    Didnt make any partitions or have to format anything, i went a little overboard and created a 200mb swapfile, kept it on the internal sd
    and am using minfree manager with the preset set to mild and swappiness set to 50
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    Re: A Guide for the Centura, of sorts...

    « Reply #7 on: May 08, 2015, 12:16:14 AM »
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    Your welcome for the info.
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    Re: A Guide for the Centura, of sorts...

    « Reply #8 on: May 08, 2015, 12:19:36 AM »
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    Ah, you just answered my next question about your presets for minfree manager.  One more question, how is the performance?

    Now it seems we have 2 methods to use daddy's swap kernel.

    1- On internal SD per serfassmikes instructions
    2- On external SD per daddy's instructions in his OP

    I'll update the OP...

    OP updated
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    Re: A Guide for the Centura, of sorts...

    « Reply #9 on: May 08, 2015, 12:27:35 AM »
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    Good performance, no vibs or browser or anything else force closes
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    Re: A Guide for the Centura, of sorts...

    « Reply #10 on: May 08, 2015, 12:28:26 AM »
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    Excellent.  Thanks...
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    Re: A Guide for the Centura, of sorts...

    « Reply #11 on: May 08, 2015, 12:29:49 AM »
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    Your welcome
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    Re: A Guide for the Centura, of sorts...

    « Reply #12 on: May 08, 2015, 10:53:13 AM »
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    Just a cautionary remark for users who plan on using swap.  From the reading up I've been doing on swap, if you set up your swap file on your internal sd (/data), there is a slight risk that bad blocks could build up in your nand memory and once that happens that space is gone forever, as I understand it.  Using swap on your external sd card may be safer for your phone, but the lifespan of your external sd card may be shortened and performance may take a hit since external sd cards are slower than internal memory.  The trade off is that you can always buy a new external sd card, while phones are much more expensive.
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    Re: A Guide for the Centura, of sorts...

    « Reply #13 on: May 09, 2015, 10:22:49 PM »
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    Added an AA51 mods section (only 1 there now, still searching), and several more links for roms, boot animations, root files and themes...Gonna keep updating and adding links so the list can be as complete as I can get it, but not repetitive...
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    Re: A Guide for the Centura, of sorts...

    « Reply #14 on: May 10, 2015, 08:57:55 AM »
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    Awesome work guys!  Thanks for adding to AA51 and helping guys like me who tend to be less than genius at this stuff!
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    nice fart, that's gonna itch when it dries...

    Re: A Guide for the Centura, of sorts...

    « Reply #15 on: May 10, 2015, 09:56:08 AM »
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    No problem.  I'm less than a genius myself.  We appreciate it. Thanks...
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    Re: A Guide for the Centura, of sorts...

    « Reply #16 on: May 10, 2015, 06:20:01 PM »
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    No problem don, and were you able to get the swap kernel and swapfile set up?
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    Re: A Guide for the Centura, of sorts...

    « Reply #17 on: May 10, 2015, 08:55:02 PM »
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    No problem don, and were you able to get the swap kernel and swapfile set up?
    I did, Thanks for all your help!
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    Re: A Guide for the Centura, of sorts...

    « Reply #18 on: May 10, 2015, 10:18:03 PM »
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    Your welcome. Now ive had one instance of my browser vibing and closing out since i moved the swapfile to the extsd card, so maybe you could talk to lael and find out maybe a way to improve the settings or adding a mod if you choose to, cause im still in the learning process of all this customization stuff myself
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    Re: A Guide for the Centura, of sorts...

    « Reply #19 on: May 11, 2015, 09:52:23 PM »
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    I'm not too worried about it, hasn't been a problem yet, but i'll keep that in mind just in case!
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    nice fart, that's gonna itch when it dries...

    Re: A Guide for the Centura, of sorts...

    « Reply #20 on: May 13, 2015, 12:07:16 PM »
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    ok. its more likely to happen if the website isnt mobile-friendly.
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    Re: A Guide for the Centura, of sorts...

    « Reply #21 on: May 13, 2015, 04:35:46 PM »
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    Hope you figured it out.  Can't really think of any reason why it would be fine on internal, but not on external, unless it has to do with the slower speeds on external.

    Btw, added a section on TCP Congestion Algorithms to OP.  Also adjusted some tweaks, added a few more download links and the like.  Gotta tell ya, my phone is running super smooth and quick right now...
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    Re: A Guide for the Centura, of sorts...

    « Reply #22 on: May 13, 2015, 08:30:11 PM »
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    You guys are moving right along with the post and the how to....great job guys Thanks
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    Re: A Guide for the Centura, of sorts...

    « Reply #23 on: May 13, 2015, 08:36:32 PM »
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    Thanks daddy.  I feel like I'm learning a little bit more each day after researching, reading and testing and what not.  Its been fun...I hope people find it useful...
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    Re: A Guide for the Centura, of sorts...

    « Reply #24 on: May 13, 2015, 08:46:46 PM »
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    im sure they do...remember we have a lot of members that read the post dl what we have and try them out and never leave a remark...also some even share on other forums of what we have.......if its helped you at all then thats what really matters.........you guys have taken some thing as little as a swap kernel and went all out........
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