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

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Message-ID: <4AA6AB52.8070206@arcor.de>
Date:	Tue, 08 Sep 2009 22:06:58 +0300
From:	Nikos Chantziaras <realnc@...or.de>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Pekka Pietikainen <pp@...oulu.fi>, Michael Buesch <mb@...sch.de>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>, Felix Fietkau <nbd@...nwrt.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

On 09/08/2009 02:35 PM, Ingo Molnar wrote:
>
> * Nikos Chantziaras<realnc@...or.de>  wrote:
>
>> [...] That would mean that you (or anyone else with an interest of
>> tracking this down) would follow the examples given (by me and
>> others, like enabling desktop compositing, firing up mplayer with
>> a video and generally reproducing this using the quite detailed
>> steps I posted as a recipe).
>
> Could you follow up on Frederic's detailed tracing suggestions that
> would give us the source of the latency?

I've set it up and ran the tests now.


> ( Also, as per lkml etiquette, please try to keep the Cc: list
>    intact when replying to emails. I missed your first reply
>    that you un-Cc:-ed. )

Sorry for that.


> A quick look at the latencytop output suggests a scheduling latency.
> Could you send me the kernel .config that you are using?

That would be this one:

     http://foss.math.aegean.gr/~realnc/kernel/config-2.6.31-rc9
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