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

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Date:	Tue, 08 Sep 2009 13:13:34 +0300
From:	Nikos Chantziaras <realnc@...or.de>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

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.
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