[TWEAK] Kernel tuning script -- UPDATED!

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Hi all,
since I've said goodbye to my Milestone, in these days, prior to selling it, my good behavior said to me "okay, no customkernel, you can't help with RSA...so Milestone owners are ****ed...ouh, no, wait!"
...and then prior to selling it I've tested some things and I've found that sysctl is working!

Since sysctl is working and I'm on Linux from about 10 years, I've been played with our kernel in Milestone and tested some parameters.. and I've had a speedup in my daily operations: browse the net with Dolphin Browser HD, play some games, sync email, make calls, sms etc... and I've found that my Milestone is way more responsive and feels smoother!

Sysctls tested on the great CyanogenMod port by nadlabak.

So, well, here's the script. Feel free to execute it at boot (if you execute it at boot, your phone will boot slightly faster) and/or to integrate in your custom nandroid ROMs

#!/system/bin/sh
sysctl -p
#
#Disable normalized sleeper
#
mount -t debugfs none /sys/kernel/debug
echo NO_NORMALIZED_SLEEPER > /sys/kernel/debug/sched_features
#
#  Memory management
#
echo 2048 > /proc/sys/kernel/msgmni
echo 64000 > /proc/sys/kernel/msgmax
echo 268435456 > /proc/sys/kernel/shmmax
echo "500 512000 64 2048" > /proc/sys/kernel/sem
sysctl -w net.core.wmem_max=524288
sysctl -w net.core.rmem_max=524288
sysctl -w net.ipv4.tcp_tw_recycle=1
sysctl -w net.ipv4.tcp_rmem='6144 87380 524288'
sysctl -w net.ipv4.tcp_wmem='6144 87380 524288'
sysctl -w kernel.sched_latency_ns=600000
sysctl -w kernel.sched_min_granularity_ns=400000
sysctl -w kernel.sched_wakeup_granularity_ns=400000

EDIT: UPDATE N.3

This script makes the Linux kernel to take a little more RAM, so I don't recommend to use it in HTC Sense builds, since Sense is already crashing because of heavy RAM usage, but with CM and LauncherPro, with a lot of progs open in background I've never went out of RAM!

NOTE: Make sure that you've got echo and sysctl in /system/xbin/ otherwise this won't have any effect!


Even if I'm returning to HTC I'm sad for my old Milestone, I like its shell so much...it's a really beautiful device!

Hoping for the best for u, Milestone users
-kholk

Very interesting. Could you please advice what I need to do to execute the script at boot?

Originally Posted by kholk

I've found that sysctl is working!

#!/system/bin/sh
/system/xbin/echo 2048 > /proc/sys/kernel/msgmni
/system/xbin/echo 64000 > /proc/sys/kernel/msgmax
/system/xbin/echo 268435456 > /proc/sys/kernel/shmmax
/system/xbin/echo 500 512000 64 2048 > /proc/sys/kernel/sem
/system/xbin/sysctl -w net.core.wmem_max=524288
/system/xbin/sysctl -w net.core.rmem_max=524288
/system/xbin/sysctl -w net.ipv4.tcp_tw_recycle=1
/system/xbin/sysctl -w net.ipv4.tcp_rmem='6144 87380 524288'
/system/xbin/sysctl -w net.ipv4.tcp_wmem='6144 87380 524288'

Hoping for the best for u, Milestone users
-kholk

ciao kholk

Want to know if you put a sysctl binary in xbin?
Cause your script suppose to have sysctl in xbin right?
Can you make a download of it? Or is a symlink from busybox?

Grazie per questa drittona per il pietrone

EDIT: okok resolved, had to --install busybox -s xD
NO PROBLEM now testing!!

This script is supposing that you've got echo and sysctl in /system/xbin/
If you haven't got echo and sysctl in /system/xbin/ this script won't have any effect.

And how would i go about obtaining those?

Sent from my Milestone using XDA App

Install busybox and with it you should have installed those.

I didn't think sysctl would work on this kernel. Since it does, here's some more optimizations that I know work for Eclair and earlier:

/system/xbin/sysctl -w kernel.sched_latency_ns=600000
/system/xbin/sysctl -w kernel.sched_min_granularity_ns=400000
/system/xbin/sysctl -w kernel.sched_features=24188

The default latencies were a little ridiculous. And the CFS features disabled here are pointless, even on desktops.

That said, thanks for pointing out that it works! Much appreciated. Best of luck with your HTC device.

Very nice, thanks kholk!
Thanks xslntx!

Script updated.

-- Absolute path not needed.
-- Added scheduler tuning for granularity latencies
-- Normalized sleeper disabled.

Testing it with great results (in combination with xlsntx parameters)
graphic performance are improved, usage is clearly improved,
in opposition to that bench are lower, I mean, I donot understan:
In Quadrant, I have nearly 3\4 fps MORE than normal in EACH test (except for the planet one) -wich is nealrly the performance a droid2 has...- and have a result like 20\25 point lower...dunno...another dimostration that benchs aren't much reliable...