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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? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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