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[KERNEL] [SM-T700 WIFI & T705 LTE] [08 Oct] SkyHigh TW Kernel [v1.9.1] [Synapse ++]

OP UpInTheAir

Announcement from UpInTheAir: Development suspended due to real life commitments
6th July 2014, 03:32 AM   |  #1  
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[KERNEL] [SM-T700 WIFI & T705 LTE] [08 Oct] SkyHigh TW Kernel [R3_v1.9.1] [Synapse ++]

8.4" SM-T700 WIFI & T705 LTE TW Exynos 5420 supported in thread only !!

I don't have time to build for any more devices I can't personally test & debug - sorry.


Let get it straight, I am not a real Developer, but I am UpInTheAir, former part time kernel hack of SM-T800/805, SM-N9005 LTE, SGT 7.7 JB & ICS Kernels. I now share with you my Exynos5 TW SM-T700 WIFI & SM-T705 LTE kernels compiled from official Samsung sources.


* I don't pretend to know everything, so if you can be constructive and help out this project, please do so. You will find allot of answers by searching gitHub, XDA and SEARCH Just like I do ......


>> SCREENSHOTS << from v0.5 : might not be always up-to-date !


FEATURES

Based on official Samsung source: T700OPU1ANG2

ramdisk source: T700KXU1ANG1 & T705XXU1ANG2

Built with Stock ARM Toolchain 4.7

Compiled with KERNEL_MODE_NEON & -mfpu=neon-vfpv4 & hard float

KNOX WARRANTY VOID: 1

SELinux PERMISSIVE

adb insecure

ROM Knox removal via updater-script on flash

init.d script support (drop in script & set permissions to 755 or 777 and reboot)

busybox v1.22.0-Dream-IRC installed to /sbin

Will NOT delete your WIFI settings & passwords

Possible Screen Mirroring / AllShare Cast fix

Synapse app support for almost all kernel configurations + more !!

Many descriptions are in the app ! If you require more info, don't be lazy, please SEARCH like I did !


SYNAPSE FEATURES

CPU
  • CPU max frequency A15 cores = 2100 MHz (stock/default = 1900 MHz)
  • CPU min frequency A7 cores = 200 MHz (stock/default = 500 MHz)
  • Multi-core power saving control (sched_mc_power_savings)


CPU VOLT
  • Voltage control for:
    big cores
    LITTLE cores


GOV
  • CPU governor
    interactive (default)
    on-demand (tweaked to use power efficient workqueues)
    conservative
  • CPU governor tunables


MEMORY
  • I/O Schedulers
    BFQ (default - tweaked for SSD)
    DEADLINE (tweaked for SSD)
    CFQ
    NOOP
    FIOPS
    SIO
    ZEN
  • General IO tuneable
  • Int storage scheduler
  • Int storage read-ahead (1024 KB for 16 GB partition)
  • Kernel SamePage Merging (KSM)
    Pages to Scan
    Scan delay interval
    Deferred Timer control
  • Virtual Memory
    VNSWAP control
    ZSwap memory pool control
    Dirty Background Ratio
    Dirty ratio
    Swapiness


INT/MIF
  • CPU internal frequency voltage control (MHz)
    133 - 222 - 333 - 400 - 440 - 460 - 480 - 500 - 600
  • Memory frequency voltage control (stock max = 733 MHz)
    160 - 200 - 266 - 400 - 533 - 667 - 733 (1.9 GHz) - 800 (2.0 GHz) - 933 (2.1 GHz)


GPU
  • GPU max frequency = 667 MHz (stock/default = 480 MHz)
  • GPU min frequency = 100 MHz (stock/default = 177 MHz)
  • GPU voltage control


POWER SUSPEND
  • PowerSuspend
    Autosleep_hook
    Userspace_trigger
    DisplayPanel_hook
    Hybrid_hook (default)
  • PowerSuspend State (only with Userspace_trigger)
  • Dynamic Fsync control (default enabled)
  • Dynamic management of dirty page writebacks
  • Adaptive VFS Cache Pressure on Suspend / Resume


ADVANCED
  • Low Memory Killer (OOM LMK)
  • Management of not killable processes whitelist
    system apps
    user apps
  • Entropy
  • Gentle Fair Sleepers control
  • randomize_va_space control


THERMAL
  • CPU thermal control
  • GPU thermal control
  • Memory interface thermal control


AUDIO

* WolfsonMicro WM5102 sound control by AndreiLux
  • Mono output
  • HeadPhone equalizer settings


BATTERY
  • Unstable power detection
  • AC mains
  • Standard downstream port
  • Dedicated charging port
  • Charging downstream port
  • Accessory charger adapter
  • Miscellaneous charging
  • MHL power
  • Battery Scaling Calibration (fuel-gauge chip reset)


NETWORK
  • TCP congestion control
    All available enabled.
    Default = westwood+
  • WiFi Power Mode While Screen-On/Off
  • WiFi DTIM Interval While Screen-On/Off
  • tcp_default_init_rwnd
  • TCP/IP network security
  • TCP/IP network speed
  • GPS region
    Default, Asia, Europe, Oceania, North America, South America, Africa


USB
  • UMS (USB Mass Storage) mode
  • MTP mode
  • USB Keyboard / Mouse (with USB Keyboard app)


BACKUP & RESTORE
  • Restore - Delete - Backup
    kernel
    profile


REBOOT
  • Reboot device
  • Recovery Mode
  • Download Mode
  • Power Off
  • Clear Synapse Data


FS (File System)
  • Display FS Type
  • FS Controls
    remount System R/W R/O
    remount RootFS R/W R/O
  • Maintenence
    optimise databases (SQLite3)


LOGS
  • Android logger control (disabled)
  • logcat
  • dmesg
  • last_kmsg


xz kernel compression

Reduced logging

enable ARCH_POWER

use WQ_POWER_EFFICIENT

optimized SLUB memory allocator

Frandom

mount partitions NOATIME and NODIRATIME by default

FIDTRIM

F2FS support in source and ramdisk (not tested)

exFAT FS support

NTFS R/W support with app

CIFS support

Asynchronous Fsync

WIFI: filter multicast packages while suspended

/proc/.config.gz support



CREDITS


* My family !!
* BeansTown106 & Chainfaire for bringing root
* halaszk88 - initial sysnapse layout & source commits
* AndreiLux - many many contributions to Exynos kernel development & Synapse app
* apbaxel - various synapse controls I've adapted
* faux123 - various patches
* Yank555 - various patches
* XDA
* Samsung OSRC
* and many others!
* check github source credits
* IF I'VE FORGOTTON ANYONE, PLEASE DON'T BE SHY AND SPEAK UP, THANKS


XDA:DevDB Information
SM-T700 WIFI & T705 LTE TW Kernel, Kernel for the Samsung Galaxy Tab S

Contributors
UpInTheAir
Kernel Special Features:

Version Information
Status: Stable
Current Stable Version: v1.9.1
Stable Release Date: 2014-10-08

Created 2014-07-06
Last Updated 2014-10-08
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Last edited by UpInTheAir; 9th October 2014 at 02:56 AM.
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6th July 2014, 03:32 AM   |  #2  
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Database Requirements - installation & download
** DISCLAIMER : FLASH AT YOUR OWN RISK **

WARNING :

* Under-volting can cause instability

* Over-clocking can cause freeze/reboot, heat & damage to CPU, GPU or other hardware

* Any customizations may void warranty

* May not be suitable for your device or customizations

* UpInTheAir is NOT responsible, the person you see in the mirror is !



REQUIREMENTS
  1. Watch >> THIS <<
  2. SM-T700 WIFI or T705 LTE Exynos device
  3. TW Kit Kat 4.4.2
  4. Rooted
  5. KNOX disabled/removed (if flashing kernel via custom recovery - no need to worry unless you have flashed a Knox enabled ROM after)
  6. TWRP Recovery


CHANGE-LOG

v1.9.1 [07-Oct-2014]

ramdisk :
  • synapse: FS: bug fix - Optimise Databases error if no sdcard/SkyHigh/Log folder not present


v1.9 [06-Oct-2014]

ramdisk :
  • init.rc: remove Gentle Fair Sleepers boot default - now disabled by default in source
  • synapse: Backup Restore: fixed bug not backing up & restore current kernel
  • synapse: FS: add push button to Optimise Databases (SQLite3)

kernel :
  • xz: tweaking kernel compression
  • af_unix: speedup /proc/net/unix
  • sched: disable GENTLE_FAIR_SLEEPERS by default
  • mm: don't wait for congestion when mem is high
  • block: disable add_random for more performance on SSD's
  • fs/dyn_sync_cntrl: on by default if enabled in defconfig
  • mmc: disable CRC check for better performance
  • mm: optimize Kernel Samepage Merging (KSM)
  • Input: send events one packet at a time
  • lib/int_sqrt.c: optimize square root algorithm
  • readahead: make context readahead more conservative
  • gpu: ion: system_heap: add support for 2MB allocations
  • CHROMIUM: clocksource: allow clocksources to be selected earlier during boot


v1.8 [30-Sept-2014]

ramdisk :
  • init.rc: Create mountpoint so Dalvik can mark as slave in zygotes to allow CIFS mounting and other app databases.
  • synapse: USB: add MTP mount option (if is doesn't mount storage properly on PC, just toggle between Default > MTP )
  • synapse: INT/MIF voltage control

kernel :
  • EXYNOS5420 MIF: unlock MIF 933 MHz & set for CPU 2.0+ GHz freq
  • opp: De-obscurify OPP structs and disclose find_device_opp
  • devfreq: add Exynos 5420 MIF voltage control
  • devfreq: add Exynos 5420 INT voltage control
  • MIF / INT fix
  • MIF / INT: allow 6250 mV increments
  • EXYNOS5420 MIF: set 800 MHz for CPU 2.0 GHz freq
  • workqueue: fix permission for power_efficient


v1.7 [21-Sept-2014]

kernel :
  • arch/arm/Makefile: adaptation to full neon-vfpv4 support
  • sched: GENTLE_FAIR_SLEEPERS fix unused cpu var
  • drivers/staging: configurable android log buffer sizes
  • config: set LOGCAT_SIZE=256
  • ext4: Speedup WB_SYNC_ALL pass called from sync(2)
  • bfq-iosched: tuning for SSD
  • ksm: check and skip page, if it is already scanned
  • config: enable KSM_CHECK_PAGE
  • config: enable Conservative & disable Userspace governor


v1.6 [17-Sept-2014]

ramdisk :
  • init.rc: set defaults: removed KSM deferred_timer as now set enabled in source
  • synapse: Network: tcp_default_init_rwnd (not sure how to tune the value yet)
  • synapse: Reboot: added Power Off option

kernel :
  • cifs: enable mounting cifs drives visible to all apps
  • config: enable CIFS RESTRICT_ROOTFS_SLAVE
  • block: Reserve only one queue tag for sync IO if only 3 tags are available
  • setlocalversion: do not append -dirty when there are un-committed changes
  • kswapd: reduce time spent in congestion_wait
  • workqueue: add system wide power_efficient workqueues (battery)
  • config: enable WQ_POWER_EFFICIENT (battery)
  • CPUFREQ: ondemand: use power efficient wq (battery)
  • mutex: Make more scalable by doing less atomic operations
  • mutex: Queue mutex spinners with MCS lock to reduce cacheline contention
  • writeback: fix writeback cache thrashing
  • sched: Make scheduler aware of cpu frequency state
  • bcmdhd4354: filter multicast packages while suspended (battery)
  • tcp: add a sysctl to config the tcp_default_init_rwnd
  • net: tcp: optimization with rcv_wnd
  • vfp/Makefile: compile with -mfpu=neon-vfpv4 & hard float
  • slub: optimized SLUB memory allocator
  • net: loopback: set default mtu to 64K
  • ksm: enable deferred_timer by default to prevent the CPU to be wakened for ksm activities
  • ext4: add support for FIDTRIM, a best-effort ioctl for deep discard trim (no idea if it's working)
  • Report permissive mode in avc: denied messages
  • config: disable mutex debugging


v1.5 [10-Sept-2014]

ramdisk :
  • init.rc: set defaults: Dynamic FSync enabled

kernel :
  • ARM: implement KERNEL_MODE_NEON
  • config: enable KERNEL_MODE_NEON
  • Makefile: added ccache for speed up kernel compile
  • sync: don't block the flusher thread waiting on IO
  • staging: android: lowmemorykiller: select a new task to kill
  • SELinux: Reduce overhead of mls_level_isvalid() function call
  • SELinux: Fix kernel BUG on empty security contexts
  • fix compile warning for Async Fsync
  • arm/crypto: add optimized AES and SHA1 routines
  • config: enable CRYPTO_SHA1_ARM & CRYPTO_AES_ARM
  • softirq: reduce latencies
  • ext4: speed up truncate/unlink by not using bforget() unless needed
  • mm: Clear page active before releasing pages


v1.4 [07-Sept-2014]

ramdisk :
  • synapse: Memory: VNSWAP control (1>1024 MB - Unable to disable (reset) / set size to 0 yet)
  • synapse: Memory: ZSwap memory pool control
  • synapse: Memory: Deferred Timer control
  • synapse: minor typo, cleanup & corrections to general layout and descriptions

kernel :
  • ksm: Provide support to use deferred timers for scanner thread
  • sched: LOAD_FREQ (4*HZ+122) avoids loadavg Moire
  • staging: android: lowmemorykiller: implement task's adj rbtree
  • config: enable ANDROID_LMK_ADJ_RBTREE
  • cpufreq: tidy up
  • block: add SIO I/O scheduler
  • block: add ZEN I/O scheduler
  • config: enable SIO & ZEN I/O schedulers


v1.3 [03-Sept-2014]

ramdisk :
  • synapse: Reboot: added Reboot to Download Mode
  • synapse: USB: USB Mouse / Keyboard control
  • ramdisk: file_contexts: add busybox to file_contexts to allow via SELinux

kernel :
  • cpufreq: Fake the IKS specific frequency table to stock values (fixes: corrects to stock CPU touch boost frequencies & CPU freq in Power Saving Mode)
  • lib: memcopy & string use glibc version
  • scheduler: update BFQ-v7r4 to BFQ-v7r5 for 3.4.0
  • drivers: usb: Use Android device as USB keyboard/mouse
  • USB KEYBOARD/MOUSE: added on/off trigger to driver


v1.2 [01-Sept-2014]

ramdisk :
  • synapse: Network: WiFi Power Mode controls

kernel :
  • BCMDHD4354: WIFI PM support for KitKat driver
  • BCMDHD4354: WIFI: POWERSUSPEND support
  • sched: cpu_power: enable ARCH_POWER


v1.1 [31-August-2014]

ramdisk :
  • init.rc: added some more boot defaults
  • synapse: new PowerSuspend controls: (enabled Hybrid as default)

kernel :
  • kernel/power/powersuspend: cumulative update to version 1.5
  • kernel/power/powersuspend: LCD screen on/off hooks


v1.0 [27-August-2014]

ramdisk :
  • default.prop: Possible Screen Mirroring / AllShare Cast fix (please give FULL report !!)
  • init.rc: added some more boot defaults
  • synapse: added to descriptions & general clean up
  • synapse: PowerSuspend: (enabled by default)
    added dynamic Fsync control (disabled by default)
    moved Dynamic Dirty Page Writeback controls
    added Adaptive VFS Cache Pressure on Suspend / Resume
  • synapse: Battery: added Battery Scaling Calibration (fuel-gauge chip reset)
  • synapse: Reboot: added Clear Synapse Data button

kernel :
  • fs/dyn_sync_cntrl: dynamic Fsync control v1.5
  • fs/dcache.c: adaptive vfs_cache_pressure on suspend / resume
  • fs/aio.c: Asynchronous I/O latency to a solid-state disk greatly increased
  • enabled AIO
  • kernel: sched: LOAD_FREQ (4*HZ+61) avoids loadavg Moire
  • config: set default TCP Westwood+ -- remembered at last :)
  • Dynamic read-ahead (1024 kB for 16 GB partition)
  • block: add FIOPS I/O scheduler
  • block: deadline: tweaks
    Optimize for non-rotational
    allow 0ms deadline latency, increase the read speed


v0.9 [22-August-2014]

updater-script :
  • Knox removal

ramdisk :
  • T700: new T700KXU1ANG1 ramdisk (thanks @stitoo )
  • init.rc: added some more boot defaults
  • synapse: Audio: removed Main Speaker amplification & equalizer (only top speaker was boosted)
  • synapse: Drivers: added PowerSuspend control
  • synapse: Memory: added Dynamic Dirty Page Writeback controls
  • synapse: Advanced: added LMK Whitelist control for Do-Not-Kill Processes
  • synapse: various small cleanups
  • init.universal5420.rc: mount F2FS

kernel :
  • Completely rebuilt on newer T700OPU1ANG2 source
  • removed GPU 733 MHz freq step. Max now at 667 MHz (optional)
  • kernel/power/powersuspend: new PM kernel driver for Android w/o earlysuspend v1.2
  • staging: android: lowmemorykiller: Management of not killable processes (read Post #3 )
  • mm: Dynamic management of dirty page writebacks
  • config: enable LAST_KMSG
  • Asynchronous Fsync: initial extraction of Async Fsync from HTC
  • FS: import F2FS


v0.7 [16-August-2014]

ramdisk :
  • T700: new ramdisk from T700XXU1ANF9 (thanks @mitchellvii )
  • T705: new ramdisk from T705XXU1ANG2 (thanks @edan1979 )
  • synapse: Reboot: added reboot & recovery options
  • synapse: removed Audio checkboxes to enable speaker & headphone equalizer settings (enabled by default)

kernel :
  • Completely rebuilt on newer T700XXU1ANF7 source
  • added GPU 733 MHz freq step (optional) will decrease benchmark due to thermal throttle, but what the heck !
  • MALI_DVFS-START FEQ set to 100 MHz (will allow launcher to idel lower & use loads more of user set min GPU freq )
  • Kernel compression mode changed to XZ (smaller zImage & stops kernel flash damaging the Recovery partition )
  • removed useless CPU Performance governor


v0.6 [12-July-2014]

ramdisk :
  • synapse: Network: TCP/IP network security
  • synapse: Network: TCP/IP network speed
  • synapse: Network: GPS region
  • synapse: USB: UMS (USB Mass Storage) mode


v0.5 [11-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: adjustments to various layout options and info
  • synapse: audio controls (some omitted for now)

kernel :
  • WolfsonMicro WM5102 sound control by AndreiLux


v0.4 [10-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: adjustments to various layout options and info
  • synapse: CPU: multi-core power saving control (sched_mc_power_savings)
  • synapse: Advanced: randomize_va_space control
  • /sbin/SkyHigh.sh: enable frandom & fix init.d

kernel :
  • add frandom
  • fs: mount partitions NOATIME and NODIRATIME by default
  • BFQ-v7r4 IO scheduler & set as default)
  • config: enable sched_mc_power_savings for sysfs


v0.3 [09-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: add various layout options and info
  • synapse: CPU general IO tuneable
  • synapse: Virtual memory tuneable
  • synapse: Gentle fair sleepers control (disabled to improve UI performance)
  • synapse: TCP congestion control
  • synapse: Android logger control (disabled)
  • synapse: logs - last_kmsg

kernel :
  • logger: modify for Synapse app checkbox compatibility
  • add sysfs interface for GENTLE_FAIR_SLEEPERS


v0.2 [07-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: add GPU, battery & thermal controls

kernel :
  • cpufreq: allow A15's to 2.1 GHz and A7's to 200 MHz
  • config: enable TCP congestion control & all available algorithms
  • logger: add sysfs interface to enable / disable Android Logger
  • battery: add MAX77803/UNIVERSAL5420 charger control
  • battery: add unstable power detection switch to charger controls
  • battery: properly populate current now, avg, and max output properties
  • battery: expose all MHL currents in charger controls
  • Mali GPU: OC to 677 & UC to 100 MHz
  • Mali GPU: clock & governor control
  • Mali GPU: voltage control
  • mach-exynos: lower regulator buck min voltages
  • exynos_tmu: add configurable interface


Initial Release v0.1 [06-July-2014]

ramdisk :
  • default.prop/init.rc: adb insecure, wifi fix & SELinux permissive
  • add synapse support (initial files ported from halask88 & moddified to suit)

kernel :
  • config: enable /proc/.config.gz support
  • config: enable KSM support
  • config: enable performance CPU governor
  • config: enable USB OTG support
  • config: enable NTFS RW support
  • config: enable CIFS support
  • config: disable DEBUG_INFO
  • add sysfs helpers
  • cpufreq: add Exynos 5420 voltage control



INSTALLATION
  1. Watch >> THIS <<
  2. Uninstall any CPU control apps, tweaks and scripts etc.
  3. Ensure KNOX is disabled/removed (only if NOT flashing with custom recovery)
  4. Recommend: Install Wanam DVFS disabler for greater kernel control
  5. Recommend: Backup your current kernel with TWRP Recovery
  6. Install Synapse app from Google Play and rate it ☆☆☆☆☆ !!
  7. Flash with TWRP Recovery
  8. Any issues, please check Posts #1-3 and search the thread BEFORE posting


DOWNLOAD


8.4" TF700 WIFI EXYNOS

>> WIFI SkyHigh T700 WIFI kernel <<

STOCK T700 WIFI T700KXU1ANG1 kernel (Flashing Stock will wipe your WiFi setings !)

---------------------------------------------------------------------------------------------------

8.4" TF705 LTE EXYNOS

>> LTE SkyHigh T705 LTE kernel <<

STOCK T705 LTE T705XXU1ANG2 kernel (Flashing Stock will wipe your WiFi setings !)



SOURCE

>> github <<


.
Last edited by UpInTheAir; 8th October 2014 at 10:05 AM.
The Following 16 Users Say Thank You to UpInTheAir For This Useful Post: [ View ]
6th July 2014, 03:32 AM   |  #3  
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Thanks Meter: 5,157
 
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Join Date:Joined: Jan 2011
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Question HELP & FAQ
HELP & FAQ


"SYNAPSE BOOT CANCELLED"

  1. Wait for the kernel to stabilize and device to cool
  2. Open synapse app
  3. Synapse app menu > select all globally > undo > apply ✔
  4. Re-boot
  5. If still issues > try again after #1
  6. Still issues > Manually set config after boot (open synapse app > syanapse app menu > settings > disable apply on boot)


ISSUES

  1. Uninstall any CPU control apps, tweaks and scripts etc.
  2. Install Wanam DVFS disabler for greater kernel control
  3. Flash kernel
  4. Boot and allow things to stabilize
  5. Open Synapse & tap :
    "understood" message about unstable boot
    "select all globally"
    "undo" button
    "apply" ✔
  6. Reboot and ensure "synapse boot completed" toast message
  7. You should be good to go


BOOT-LOOP

  1. Power off & let device cool
  2. Wipe cache & dalvik-cache in recovery (if custom recovery)
  3. Re-flash kernel
  4. Re-boot
  5. Let things stabilize and cool before touching anything


BETTER BATTERY LIFE

  1. There are no best settings. User "HABIT" is #1 cause of battery drain, followed by screen, ROM & apps, modem etc
  2. This kernel is built to be balanced with a good mix of battery whilst keeping performance
  • Decrease screen brightness
  • Use dark wallpapers and app themes
  • Check your wakelocks with better battery stats app & use Greenify app to stop unwanted apps self starting and running in the background
  • Suggest:
    CPU governor = ondemand (tweaked for power efficient workqueues)
    CPU 200-1900 MHz -25 mV
    GPU 100-480 MHz -50 mV (100 MHz may induce some GUI sluggishness)
    PowerSuspend Driver = Enable
    Dynamic FSync = Enable
    Dirty Page Writeback = Enable
    CPU Multicore Power Saving = (2) Agressive


BETTER PERFORMANCE




HOW TO BACKUP YOUR STOCK KERNEL BEFORE FLASHING SkyHigh KERNEL

  • Boot into TWRP Recovery
  • Select Backup
  • Select "[X] Boot" only (boot.img/kernel)
  • Select Storage > Micro SD (if external sdcard installed) > OK
  • Swipe to backup



CAN I USE OTHER KERNEL CONTROL APPS

  • No, many features and options won't be available. Remove all other control apps to avoid conflicts !
  • Synapse is the recommended and has everything you need


HOW TO MONITOR LIVE CPU & GPU VALUES

  • CPU load & freq - available RAM - GPU freq - CPU temp - most resource intensive process
  • [APP][2.1+] Cool Tool
  • Download my personal cooltool_presets > unzip & copy folder to INTERNAL sdcard. If you have cool tool app already running, you must disable > overwrite existing folder > enable


LITTLE CORE CPU FREQUENCY

  • Real frequency is apparently double that reported by other apps
  • Example: min 200 MHz (real) in Synapse is reported as 100 MHz in SetCPU


RANDOM REBOOT

  1. Don't UV or UC CPU or GPU
  2. Use SkyHigh defaults


DOWNLOAD LINK NOT WORKING

  1. I want to keep this project all in one place (Thanks to XDA) - ☆☆ NO MIRRORS ☆☆
  2. Please try again in a few minutes


POOR CPU/GPU BENCHMARK or GRAPHICS PERFORMANCE

  1. Allow the device to cool. Repetitive testing will heat the device hardware and invoke thermal throttling and lead to decreased benchmark.
  2. HIGH CPU/GPU OC >> excessive heat >> thermal throttling >> reduced clock frequency >> DECREASE PERFORMANCE


DO NOT KILL PROCESSES

  1. This feature allows the user to define processes and system processes white-lists filled with the preferred process names and to not be killed by lowmemorykiller, unless it is absolutely necessary.
  2. When a the lowmemorykiller needs to free ram, it will first kill the processes not included inside the two process name lists chosen by the user.
  3. If there are no more standard killable processes, then it will be necessary to kill one of the processes included inside one of the two white-lists, to prevent system hangs, slowdowns, etc.
  4. You can find the [SkyHigh/Synapse] folder on your internal sdcard and add one process name per line. Lists updated on reboot.
  5. Max 25 processes
  6. Example only:
    Code:
    com.ea.games_r3_row
    com.quoord.tapatalkxda.pre.activity


DYNAMIC MANAGEMENT OF DIRTY PAGE WRITEBACKS

* [Christopher83]

Quote:

This feature allows to have two different intervals for dirty page
writebacks and to dynamically manage them when the system has been
resumed (it's active) or when has been suspended.

Three new procfs parameters are exposed inside /proc/sys/vm path:
- dynamic_dirty_writeback is the activation status of this feature,
set 1 to enable it, set 0 to disable it and use the standard behaviour
- dirty_writeback_active_centisecs is the interval for the dirty page
writebacks when the system is active (screen on)
- dirty_writeback_suspend_centisecs is the interval for the dirty page
writebacks when the system is suspended (screen off)

This feature is in part inspired on Francisco Franco's patch:
https://github.com/franciscofranco/m...18e7f258a22947



BACKUP & RESTORE

  1. If the backup isn't visible, reboot device and ensure for have "synapse boot completed" message. Otherwise synapse won't read the file.
  2. Reboot after applying your new settings
  3. Read "ISSUES" & "SYNAPSE BOOT CANCELLED" above


TCP/IP NETWORK SECURITY


* Thanks to zeppelinrox & V6SuperCharger
  1. Hardening the TCP/IP stack to SYN attack
  2. Bump up tw_buckets in case we get DoS'd
  3. Ignore pings
  4. Don't cache connection metrics from previous connection
  5. Don't pass traffic between networks or act as a router
  6. Enable spoofing protection (turn on reverse packet filtering)
  7. Don't accept source routing
  8. Don't accept redirects
- Further reading:
http://www.cyberciti.biz/faq/linux-k...rity-hardening
http://www.symantec.com/connect/arti...ck-syn-attacks


SEGMENTATION FAULT

  1. I don't believe it's kernel related, but rather busybox
  2. Try uninstall your ROM busybox with this app. https://play.google.com/store/apps/d...ricson.busybox and reboot.
  3. Re-flash kernel
  4. Use the busybox that comes with the kernel located in /sbin
  5. Also try to update your SuperSu and su binary if it asks and reboot.


USB KEYBOARD / MOUSE


..
Last edited by UpInTheAir; 29th September 2014 at 03:11 AM.
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6th July 2014, 04:25 AM   |  #4  
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Location v0.1 released
v0.1 is now released

Change-log in Post #2.

NOTE: commit credits are in source.

Further instructions in Synapse app & Posts #1-3

Enjoy

Cheers,

UITA

.
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6th July 2014, 06:50 AM   |  #5  
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It would appear most persons here have the sm-t800, the 10.5 with exynox cpu. Sorry I can't test your kernel though, wish I had synapse to configure my display.

Sent from my SM-T800 using Tapatalk
6th July 2014, 07:12 AM   |  #6  
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Quote:
Originally Posted by toyanucci

It would appear most persons here have the sm-t800, the 10.5 with exynox cpu. Sorry I can't test your kernel though, wish I had synapse to configure my display.

Sent from my SM-T800 using Tapatalk

True. Another tab s 10.5 here. Hope to see the 10.5 one soon.
6th July 2014, 11:32 AM   |  #7  
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Have CPU OC to 2.1 GHz & UC to 200 MHz (read as 100 in most CPU control apps) working for next release.

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6th July 2014, 12:52 PM   |  #8  
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I recommend that you put THIS IS FOR THE LTE MODEL ONLY! in flaming giant red letters to save the flash happy noobs from causing themselves trouble. You mentioned it but you know these guys never read the OP. ☺
Last edited by mitchellvii; 6th July 2014 at 12:55 PM.
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6th July 2014, 01:26 PM   |  #9  
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Quote:
Originally Posted by mitchellvii

I recommend that you put THIS IS FOR THE LTE MODEL ONLY! in flaming giant red letters to save the flash happy noobs from causing themselves trouble. You mentioned it but you know these guys never read the OP. ☺

You're probably right. Will do later, but they'll still miss it. ......


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6th July 2014, 02:44 PM   |  #10  
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I thought the lte model uses the snapdragon processor

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