linux-kernel - Re: BFS vs. mainline scheduler benchmarks and measurements

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Message-Id: <200909102145.53332.Martin@lichtvoll.de>
Date:	Thu, 10 Sep 2009 21:45:47 +0200
From:	Martin Steigerwald <Martin@...htvoll.de>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nikos Chantziaras <realnc@...or.de>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <jens.axboe@...cle.com>,
	Con Kolivas <kernel@...ivas.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

Am Mittwoch 09 September 2009 schrieb Peter Zijlstra:
> On Wed, 2009-09-09 at 12:05 +0300, Nikos Chantziaras wrote:
> > Thank you for mentioning min_granularity.  After:
> >
> >    echo 10000000 > /proc/sys/kernel/sched_latency_ns
> >    echo 2000000 > /proc/sys/kernel/sched_min_granularity_ns
> 
> You might also want to do:
> 
>      echo 2000000 > /proc/sys/kernel/sched_wakeup_granularity_ns
> 
> That affects when a newly woken task will preempt an already running
> task.

Heh that scheduler thing again... and unfortunately Col appearing to feel 
hurt while I am think that Ingo is honest on his offer on collaboration...

While it makes fun playing with that numbers and indeed experiencing 
subjectively a more fluid deskopt how about just a

echo "This is a f* desktop!" > /proc/sys/kernel/sched_workload

Or to say it in other words: The Linux kernel should not require me to 
fine-tune three or more values to have the scheduler act in a way that 
matches my workload.

I am willing to test stuff on my work thinkpad and my Amarok thinkpad in 
order to help improving with that.

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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