Messages in this thread | | | Subject | Re: [git pull] scheduler fixes | From | Mike Galbraith <> | Date | Sat, 17 Jan 2009 07:29:36 +0100 |
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On Fri, 2009-01-16 at 20:40 -0800, Andrew Morton wrote: > On Wed, 14 Jan 2009 21:24:07 +0100 Peter Zijlstra <a.p.zijlstra@chello.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@elte.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 reproduce a very bad latency hit, investigating.
-Mike
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