[KERNEL] SpeedMod SGS2 [K2-21 CWM5 CIFS ROOT]

Hi guys,

This is the SpeedMod kernel for the Samsung Galaxy S2 GT-I9100.

SpeedMod's core features are:
- Super stable: No undervolting, overclocking or potentially unstable modifications
- Fast and smooth: Compiler and code optimizations
- Excellent battery life: Remove unecessary logging and debugging

WARNING: This kernel does NOT work on the GT-I9100G. GT-I9100 ROMs and kernels are not compatible with GT-I9100G.

>>> CLICK HERE for more info and the DOWNLOAD links.

>>> CLICK HERE for the Frequently Asked Questions list.

Current features:

Root and CWM:
- Automatically installs root (su)
- CWM recovery

Screen and misc tweaks:
- MDNIE screen sharpness tuning (improves text readability)
- MDNIE color tuning (reduces over-saturation of color)
- Lower brightness at low-light levels
- init.d, TUN, CIFS, IPV6 Privacy support

Performance:
- CPU governor tweaks: increase responsiveness
- IO tweaks
- Read ahead tweaks
- Updated to jhash3
- Compiled with optimizations using Linaro GCC 4.5 toolchain
- Switched to SLAB instead of SLUB
- Enabled CONFIG_RCU_FAST_NO_HZ

Turned off unnecessary logging for better smoothness and efficiency:
- Disabled Android Debug Logger / logcat
- Disabled Kernel debug
- Disabled Samsung debug
- Disabled CONFIG_FTRACE

More features will be added along the way.

Latest changes:

K2-1:
- Rebuilt using newer AT&T SGH-I777_Opensource source code

K2-2:
- Rebuilt using newer Linaro 2011.10 GCC 4.5 toolchain
- USB charging speed increased by 10%: current limit set to 500mA

K2-3:
- Revert faster USB charging speed, it was causing instability for some USB ports
- Disable Mali-400 GPU state tracking
- Minor bugfix to Exynos cpu suspend hotplug

K2-5:
- Rebuilt using new GT-I9100_OpenSource_Update3 source code

K2-6:
- Change to CONFIG_PREEMPT_VOLUNTARY for kernel (should have less overhead)

K2-7:
- Implemented ARM_ERRATA_743622, ext4 and mm patches from GT-N7000 sources

K2-8:
- Patched net usb drivers from GT-N7000 sources
- Revert to using CONFIG_PREEMPT
- New compiler optimization settings (smoother!)

K2-9:
- Removed -ffast-math from compiler optimizations

K2-10:
- Reworked patches from GT-N7000 sources
- Adjusted init.d script startup delay

K2-11:
- Updated wifi driver from GT-N7000 sources
- Updated CWM recovery to 4.0.1.5
- Changed some compiler optimization settings

K2-12:
- Changed some compiler optimization settings

K2-13:
- Disabled debugging: FRAME_POINTERS and ARM_UNWIND
- Modified IO tweaks (write flush timing)
- max17042: Fix fuel alert wakelocks (thanks Entropy512)

K2-15:
- Added TCP timeout tweaks

K2-16:
- Touchscreen tweaks: MOVHYST ("Vitalij fix") set to 3 (same as SGS1)
- Touchscreen sensitivity (burst length) increased

K2-18:
- Patch from Linaro to support ARM CPU topology
- Updated ARM topology patches
- Enabled sched_mc for dual-core power management
- Enabled AFTR (ARM off top running) CPU idle mode
- Nicer looking kernel version string
- Updated to CWM5
- VM patches from 2.6.36 kernel
- PREEMPT_VOLUNTARY mode
- CPU hotplug optimizations
- Disabled scheduler stats
- Disabled more debug code: STACKTRACE and LATENCYTOP
- High resolution timer HRTICK enabled in CFS scheduler
- Scheduler tweaks
- Some kernel config option cleanups
- Adjustments to compiler options
- Adjustment to wifi driver wakelock timeout
- max17042: Fix fuel alert wakelocks
- nohz: sched delay going tickless when CPU is loaded
- rcu: remove rcu_needs_cpu_flush() to avoid false quiescent states
- remove the per cpu tick skew
- Touchscreen MOVHYST ("Vitalij fix") set to 10

K2-19:
- Updated compiler options
- PREEMPT mode
- CPU hotplug changes
- Enabled KALLSYMS_ALL for Voodoo Louder and Tegrak OC compatibility
- Updated scheduler tweaks
- Disabled AFTR cpuidle mode
- Slightly more aggressive GPU DVFS speed increase
- GPU base clock set to 167MHz instead of 160MHz
- Disabled some more debug logging in the kernel

K2-20:
- CPU hotplug and frequency scaling adjustments
- GPU frequency scaling adjustments
- FUSE module included
- Increased USB charging speed to same speed as AC charger

K2-21:
- CPU frequency scaling adjusted

[HOW TO ENABLE LOGCAT]

If you are a developer or want to re-enable logcat for whatever reason, do this:

adb shell
su
mount -o remount,rw /system
echo ANDROIDLOGGER >> /system/etc/tweaks.conf
mount -o remount,ro /system

Reboot and you should have it enabled.

Disclaimer: Use at your own risk!

>>> CLICK HERE for the DOWNLOAD links.

Source code patches here.

Reserved for future use.

K2-18:
- Patches from Linaro to support ARM CPU topology
- Updated ARM topology patches
- Enabled sched_mc for dual-core power management
- Enabled AFTR (ARM off top running) CPU idle mode
- Nicer looking kernel version string
- Updated to CWM5
- VM patches from 2.6.36 kernel
- PREEMPT_VOLUNTARY mode
- CPU hotplug optimizations
- Disabled scheduler stats
- Disabled more debug code: STACKTRACE and LATENCYTOP
- High resolution timer HRTICK enabled in CFS scheduler
- Scheduler tweaks
- Some kernel config option cleanups
- Adjustments to compiler options
- Adjustment to wifi driver wakelock timeout
- max17042: Fix fuel alert wakelocks
- nohz: sched delay going tickless when CPU is loaded
- rcu: remove rcu_needs_cpu_flush() to avoid false quiescent states
- remove the per cpu tick skew
- Touchscreen MOVHYST ("Vitalij fix") set to 10

K2-16:
- Touchscreen tweaks: MOVHYST ("Vitalij fix") set to 3 (same as SGS1)
- Touchscreen sensitivity (burst length) increased