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

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Message-Id: <1252580251.18659.10.camel@marge.simson.net>
Date:	Thu, 10 Sep 2009 12:57:31 +0200
From:	Mike Galbraith <efault@....de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Nikos Chantziaras <realnc@...or.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

On Thu, 2009-09-10 at 12:28 +0200, Jens Axboe wrote:

> No difference. Then I tried switching NO_NEW_FAIR_SLEEPERS on, and then
> I get:
> 
>  Performance counter stats for 'xmodmap .xmodmap-carl':
> 
>        9.009137  task-clock-msecs         #      0.447 CPUs 
>              18  context-switches         #      0.002 M/sec
>               1  CPU-migrations           #      0.000 M/sec
>             315  page-faults              #      0.035 M/sec
>   <not counted>  cycles                  
>   <not counted>  instructions            
>   <not counted>  cache-references        
>   <not counted>  cache-misses            
> 
>     0.020167093  seconds time elapsed
> 
> Woot!

Something is very seriously hosed on that box... clock?

Can you turn it back on, and do..
	while sleep .1; do cat /proc/sched_debug >> foo; done 
..on one core, and (quickly;) xmodmap .xmodmap-carl, then send me a few
seconds worth (gzipped up) to eyeball?

	-Mike

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