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Date: Fri, 16 Jan 2009 20:40:49 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: [git pull] scheduler fixes On Wed, 14 Jan 2009 21:24:07 +0100 Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote: > On Wed, 2009-01-14 at 12:15 -0800, Andrew Morton wrote: > > On Sun, 11 Jan 2009 15:43:05 +0100 > > Ingo Molnar <mingo@...e.hu> wrote: > > > > > Please pull the latest sched-fixes-for-linus git tree > > > > In http://bugzilla.kernel.org/show_bug.cgi?id=12309 the reporters have > > identified what appears to be a sched-related performance regression. > > A fairly long-term one - post-2.6.18, perhaps. > > > > Testcase code has been added today. Could someone please take a look > > sometime? > > There appear to be two different bug reports in there. One about iowait, > and one I'm not quite sure what it is about. > > The second thing shows some numbers and a test case, but I fail to see > what the problem is with it. I had no problem seeing the problem: a gigantic performance regression in two CPU-scheduler intensive workloads. I can see some other problems, too. -- 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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