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From: Mike Galbraith <mgalbraith@suse.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: RT <linux-rt-users@vger.kernel.org>, rostedt <rostedt@goodmis.org>
Subject: Re: jitter test scalability problem - my theory
Date: Fri, 29 Jul 2011 16:47:19 +0200	[thread overview]
Message-ID: <1311950839.30862.54.camel@marge.simson.net> (raw)
In-Reply-To: <1311950140.5890.365.camel@twins>

On Fri, 2011-07-29 at 16:35 +0200, Peter Zijlstra wrote:
> On Fri, 2011-07-29 at 16:31 +0200, Mike Galbraith wrote:
> > So it seems push/pull logic _may_ be my scalability problem.  Even
> > though there's nothing that can be pushed/pulled, it's hammering a few
> > locks from many cores, so cores perturb each other enough despite
> > isolation, to fail once enough cores are active.
> > 
> > Does that look like a reasonable explanation for my jitter increase? 
> 
> It is, Steve actually had patches for that..

Thanks for confirming. 

I know a guy (me) who would _love_ to test them :)  Diagnosing is one
thing, figuring out how to fix such an issue is quite another matter.

	-Mike


      reply	other threads:[~2011-07-29 14:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-29 14:31 jitter test scalability problem - my theory Mike Galbraith
2011-07-29 14:35 ` Peter Zijlstra
2011-07-29 14:47   ` Mike Galbraith [this message]

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