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

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Message-ID: <20090910110912.GL18599@kernel.dk>
Date:	Thu, 10 Sep 2009 13:09:13 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Mike Galbraith <efault@....de>
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, Sep 10 2009, Mike Galbraith wrote:
> 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?

model name      : Genuine Intel(R) CPU           T2400  @ 1.83GHz

Throttles down to 1.00GHz when idle.

> Can you turn it back on, and do..

I guess you mean turn NEW_FAIR_SLEEPERS back on, correct?

> 	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?

Attached.

-- 
Jens Axboe


Download attachment "sched-debug-cat.bz2" of type "application/octet-stream" (12209 bytes)