Re: [ANNOUNCE] DeskOpt - on fly task, i/o scheduler optimization

[Andi Kleen <andi@firstfloor.org>]

Michal Piotrowski <michal.k.k.piotrowski@gmail.com> writes:

> Here is something that might be useful for gamers and audio/video editors
> http://www.stardust.webpages.pl/files/tools/deskopt/

To make it double cool combine that with the generic genetic 
optimizer for parameters that was posted a couple of months ago.

> 
> You can easily tune CFS/CFQ scheduler params
> 
> sched_batch_wakeup_granularity_ns
> sched_latency_ns
> sched_min_granularity_ns
> sched_runtime_limit_ns
> sched_stat_granularity_ns
> sched_wakeup_granularity_ns
> 
> back_seek_max
> back_seek_penalty
> fifo_expire_async
> fifo_expire_sync
> quantum
> slice_async
> slice_async_rq
> slice_idle
> slice_sync
> 

You should probably add the device queue length too. That seems
to often have a large impact on IO scheduling because on modern
long queue controllers the Linux IO scheduler often doesn't
have much to do because the device queue just eats it all up quickly.

-Andi