Re: BFS vs. mainline scheduler benchmarks and measurements

[Nikos Chantziaras]

On 09/08/2009 03:03 PM, Theodore Tso wrote:
> On Tue, Sep 08, 2009 at 01:13:34PM +0300, Nikos Chantziaras wrote:
> > > 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
>
> This was with an unmodified 2.6.31-rcX kernel?

Yes (-rc9).  I also tested with 2.6.30.5 and getting the same results.


> Does Latencytop do anything useful on a BFS-patched kernel?

Nope.  BFS does not support any form of tracing yet.  latencytop runs 
but only shows a blank list.  All I can say is that a BFS patched kernel 
with the same .config fixes all visible latency issues.
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