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Date: Tue, 24 Apr 2007 10:39:48 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
cc: William Lee Irwin III <wli@holomorphy.com>, Ingo Molnar <mingo@elte.hu>,
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       Thomas Gleixner <tglx@linutronix.de>, caglar@pardus.org.tr,
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Subject: Re: [patch] CFS scheduler, v3
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On Fri, 20 Apr 2007, Siddha, Suresh B wrote:

> > Last I checked it was workload-dependent, but there were things that
> > hammer it. I mostly know of the remote wakeup issue, but there could
> > be other things besides wakeups that do it, too.
> 
> remote wakeup was the main issue and the 0.5% improvement was seen
> on a two node platform. Aligning it reduces the number of remote
> cachelines that needs to be touched as part of this wakeup.

.5% is usually in the noise ratio. Are you consistently seeing an 
improvement or is that sporadic?