From: Juergen Beisert <jbe@pengutronix.de>
Organization: Pengutronix - Linux Solutions for Science and Industry
To: linux-kernel@vger.kernel.org
Date: Tue, 8 Sep 2009 13:32:45 +0200
User-Agent: KMail/1.9.9
Cc: Nikos Chantziaras <realnc@arcor.de>,
       Arjan van de Ven <arjan@infradead.org>
References: <20090906205952.GA6516@elte.hu> <20090908013800.296a5fb5@infradead.org> <4AA62E4E.4040700@arcor.de>
In-Reply-To: <4AA62E4E.4040700@arcor.de>
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Subject: Re: BFS vs. mainline scheduler benchmarks and measurements
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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@arcor.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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Pengutronix e.K.                              | Juergen Beisert             |
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