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From: Suresh Siddha <suresh.b.siddha@intel.com>
To: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Ingo Molnar <mingo@elte.hu>,
	Arjan van de Ven <arjan@linux.jf.intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
	Yanmin Zhang <yanmin_zhang@linux.jf.intel.com>,
	Gautham R Shenoy <ego@in.ibm.com>
Subject: Re: [patch 2/2] sched: fix select_idle_sibling() logic in select_task_rq_fair()
Date: Mon, 08 Mar 2010 14:24:22 -0800	[thread overview]
Message-ID: <1268087062.2830.285.camel@sbs-t61.sc.intel.com> (raw)
In-Reply-To: <1267820755.6384.85.camel@marge.simson.net>

On Fri, 2010-03-05 at 12:25 -0800, Mike Galbraith wrote:
> On Fri, 2010-03-05 at 10:39 -0800, Suresh Siddha wrote:
> > plain text document attachment (fix_lat_ctx.patch)
> > Performance improvements with this patch:
> > "lat_ctx -s 0 2" ~22usec (before-this-patch)	~5usec (after-this-patch)
> 
> Hm.  On my Q6600 box, it's nowhere near that.

My numbers are based on an atom netbook.

> Calling the waking cpu idle in that case is a mistake.  Just because the
> sync hint was used does not mean there is no gain to be had. 

Ok. I dropped that part in v2 patches that I just posted.

thanks,
suresh


  parent reply	other threads:[~2010-03-08 22:25 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-05 18:39 [patch 1/2] sched: check for prev_cpu == this_cpu in wake_affine() Suresh Siddha
2010-03-05 18:39 ` [patch 2/2] sched: fix select_idle_sibling() logic in select_task_rq_fair() Suresh Siddha
2010-03-05 20:25   ` Mike Galbraith
2010-03-06  8:21     ` Mike Galbraith
2010-03-08 22:24     ` Suresh Siddha [this message]
2010-03-09  6:05       ` Mike Galbraith
2010-03-09 13:27         ` Mike Galbraith
2010-03-10 21:14           ` Mike Galbraith
2010-03-06  8:36   ` Mike Galbraith
2010-03-05 19:36 ` [patch 1/2] sched: check for prev_cpu == this_cpu in wake_affine() Mike Galbraith
2010-03-08 19:09   ` Suresh Siddha
2010-03-08 22:25     ` Mike Galbraith

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