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

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Date:	Tue, 8 Sep 2009 08:03:11 -0400
From:	Theodore Tso <tytso@....edu>
To:	Nikos Chantziaras <realnc@...or.de>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

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

							- Ted
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