Re: BFS vs. mainline scheduler benchmarks and measurements

[Nikos Chantziaras]

On 09/08/2009 02:32 PM, Juergen Beisert wrote:
> 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@xxxxxxxx>   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?

I'm not sure what is meant with "system management code."
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