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

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Message-Id: <200909081332.46129.jbe@pengutronix.de>
Date:	Tue, 8 Sep 2009 13:32:45 +0200
From:	Juergen Beisert <jbe@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	Nikos Chantziaras <realnc@...or.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

On Dienstag, 8. September 2009, Nikos Chantziaras wrote:
> On 09/08/2009 11:38 AM, Arjan van de Ven wrote:
> > On Tue, 08 Sep 2009 10:19:06 +0300
> >
> > Nikos Chantziaras<realnc@...or.de>  wrote:
> >> latencytop has this to say:
> >>
> >>     http://foss.math.aegean.gr/~realnc/pics/latop1.png
> >>
> >> Though I don't really understand what this tool is trying to tell me,
> >> I hope someone does.
> >
> > despite the untranslated content, it is clear that you have scheduler
> > delays (either due to scheduler bugs or cpu contention) of upto 68
> > msecs... Second in line is your binary AMD graphics driver that is
> > chewing up 14% of your total latency...
>
> I've now used a correctly installed and up-to-date version of latencytop
> and repeated the test.  Also, I got rid of AMD's binary blob and used
> kernel DRM drivers for my graphics card to throw fglrx out of the
> equation (which btw didn't help; the exact same problems occur).
>
> Here the result:
>
>      http://foss.math.aegean.gr/~realnc/pics/latop2.png
>
> Again: this is on an Intel Core 2 Duo CPU.

Just an idea: Maybe some system management code hits you?

jbe

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