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Date: Mon, 31 Mar 2003 00:51:38 +0200
From: Michal Schmidt <schmidt@kn.vutbr.cz>
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To: Mike Galbraith <efault@gmx.de>
CC: linux-kernel@vger.kernel.org
Subject: Re: Reproducible terrible interactivity since 2.5.64bk2
References: <1048687681.6345.13.camel@spinel.tao.co.uk> <3E81945C.4010102@kn.vutbr.cz> <1048687681.6345.13.camel@spinel.tao.co.uk> <5.2.0.9.2.20030328181731.01997810@pop.gmx.net>
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Mike Galbraith wrote:
> 
> Greetings potential victims :)
> 
> Care to see if the attached cures your woes?
> 
> This is a mixture of Ingo's last posted plus the scheduler tuning knobs 
> patch (/proc/sys/sched/*).  I added three new knobs to watch the effect 
> on different loads.  max_accel_slices limits the amount of sleep_time 
> you may add in one activation.  retard_prct_slices is a percentage of a 
> slice to deduct from sleep_time each activation (negative feedback for 
> heavy context switchers.. dang irman process_load).  force_switch is 
> there because I'm playing :)  I didn't do much to the scheduler itself, 
> only made it switch arrays in something closer to a square wave.  With 
> the settings as in the patch, and running a kernel build, top and irman, 
> irman reports worst case response times of 150ms for NULL load, 316ms 
> for memory_load, 414 for io_load, and 504ms for process_load.
> 
> Anyway, it's attached if you want to play with it ;-)
> 
>         -Mike
> 
> Oh, it's against virgin 2.5.66.


Thanks, running 2.5.66 with the patch applied I could no more reproduce 
the problem. I haven't tried playing with the knobs.

Michal

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