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Old 01-19-2011, 02:52 PM   #1
bkuri
Linux FTW
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Posts: 1
Karma: 10
Join Date: Jan 2011
Location: Mexico City
Device: K3 3G
(Linux) Changing scheduler to noop/deadline for optimizing IO?

I have been setting noop as my scheduler for a while, and there's a minimal (some would say negligible) performance improvement overall. But the reason I'm using it is because it should also help in minimizing reads/writes to the storage card, which should help with it's life expectancy while also (indirectly) improving battery life.

Here are the tests I performed on the built-in memory card of my k3:

Code:
# mntroot rw
# cat /sys/block/mmcblk0/queue/scheduler
noop [anticipatory] deadline cfq

# time dd if=/dev/zero of=/mnt/us/test.bin bs=1M count=10
10+0 records in
10+0 records out
real	0m 1.41s
user	0m 0.00s
sys	0m 0.23s

# echo noop > /sys/block/mmcblk0/queue/scheduler
# time dd if=/dev/zero of=/mnt/us/test.bin bs=1M count=10
10+0 records in
10+0 records out
real	0m 1.10s
user	0m 0.00s
sys	0m 0.19s
For more info on this, check out this thread on xda-developers.

What I am trying to figure out now is how to set it every time the kindle is restarted (short of recompiling the kernel). I tried adding it as a @reboot crontab like so:

Code:
@reboot mntroot rw ; echo noop > /sys/block/mmcblk0/queue/scheduler ; mntroot ro
.. which failed miserably. I'm thinking about tinkering with a startup script that can write to rootfs at startup, but other than that, I'm out ideas.

Just thought I would share! Thanks for making it easy to break my k3 out of jail.

Last edited by bkuri; 01-19-2011 at 02:59 PM. Reason: grammer
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