Re: BFS vs. mainline scheduler benchmarks and measurements
From: Juergen Beisert
Date: Tue Sep 08 2009 - 07:32:59 EST
On Dienstag, 8. September 2009, Nikos Chantziaras wrote:
>
On 09/08/2009 11:38 AM, Arjan van de Ven wrote:
>
> On 2009年9月08日 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?
jbe
--
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