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

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Message-ID: <20090910162611.GA31265@elte.hu>
Date:	Thu, 10 Sep 2009 18:26:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Bret Towe <magnade@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nikos Chantziaras <realnc@...or.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	Mike Galbraith <efault@....de>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements


* Bret Towe <magnade@...il.com> wrote:

> On Thu, Sep 10, 2009 at 9:05 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > On Thu, 2009-09-10 at 09:02 -0700, Bret Towe wrote:
> >>
> >> thanks to this thread and others I've seen several kernel tunables
> >> that can effect how the scheduler performs/acts
> >> but what I don't see after a bit of looking is where all these are
> >> documented
> >> perhaps thats also part of the reason there are unhappy people with
> >> the current code in the kernel just because they don't know how
> >> to tune it for their workload
> >
> > The thing is, ideally they should not need to poke at these. 
> > These knobs are under CONFIG_SCHED_DEBUG, and that is exactly 
> > what they are for.
> 
> even then I would think they should be documented so people can 
> find out what item is hurting their workload so they can better 
> report the bug no?

Would be happy to apply such documentation patches. You could also 
help start adding a 'scheduler performance' wiki portion to 
perf.wiki.kernel.org, if you have time for that.

	Ingo
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