linux-kernel - Re: [patch] CFS scheduler, v3

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Message-ID: <Pine.LNX.4.64.0704241039110.8341@schroedinger.engr.sgi.com>
Date:	Tue, 24 Apr 2007 10:39:48 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
cc:	William Lee Irwin III <wli@...omorphy.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>, Gene Heskett <gene.heskett@...il.com>
Subject: Re: [patch] CFS scheduler, v3

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?

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