Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761365AbXKINJX (ORCPT ); Fri, 9 Nov 2007 08:09:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754247AbXKINJP (ORCPT ); Fri, 9 Nov 2007 08:09:15 -0500 Received: from smtp108.mail.mud.yahoo.com ([209.191.85.218]:41585 "HELO smtp108.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753226AbXKINJO (ORCPT ); Fri, 9 Nov 2007 08:09:14 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=vkYMcRW07FU5HwsRtAV+OOIcKlJQNnfz3aF+YLp86IfgmzK33rA9gCbpiqg7Nm7/XK9bD1/bPbzZ9YeHayTGrH9DLD0l3xbtTNmbh+rBHswoad718Ot8jV2y3kQ9qY9anUXUgne/3K+5yALmAS63I/aEvK8P9Uw/404nxDKx6p0= ; X-YMail-OSG: Te4pqIAVM1kafGDoRtVgu17d0pNonKga9HsfxVSqWHU1ZnqZu3KDPutX5xtdCvSbVjm6CNwUbg-- From: Nick Piggin To: Gregory Haskins Subject: Re: [PATCH] sched: avoid large irq-latencies in smp-balancing Date: Sat, 10 Nov 2007 00:09:55 +1100 User-Agent: KMail/1.9.5 Cc: Peter Zijlstra , Ingo Molnar , Peter Williams , linux-kernel References: <1194434956.6289.111.camel@twins> <1194437820.6289.114.camel@twins> <4732929D.604@gmail.com> In-Reply-To: <4732929D.604@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200711100009.56215.nickpiggin@yahoo.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 985 Lines: 24 On Thursday 08 November 2007 15:37, Gregory Haskins wrote: > Peter Zijlstra wrote: > > Bah, missed a hunk > > > > --- > > Subject: sched: avoid large irq-latencies in smp-balancing > > > > SMP balancing is done with IRQs disabled and can iterate the full rq. > > When rqs are large this can cause large irq-latencies. Limit the nr of > > iterations on each run. > > > > Signed-off-by: Peter Zijlstra > > CC: Peter Williams > > Tested-by: Gregory Haskins (as part of 23.1-rt11) OK, but let's not make this default for mainline just yet please. There are so many performance regression possibilities in 2.6.24 already that we should go a little bit slower for now IMO. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/