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

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Date:	Tue, 8 Sep 2009 13:35:54 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nikos Chantziaras <realnc@...or.de>
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


* 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?

( 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. )

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

	Ingo
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