Re: [git pull] scheduler fixes

[Mike Galbraith]

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@xxxxxxxxx> 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@xxxxxxx> 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

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