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

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Date:	Wed, 09 Sep 2009 01:00:47 +0300
From:	Nikos Chantziaras <realnc@...or.de>
To:	Juergen Beisert <jbe@...gutronix.de>
CC:	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

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@...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.
>
> 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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