Subject: Re: [git pull] scheduler fixes
From: Mike Galbraith <efault@gmx.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Avi Kivity <avi@redhat.com>, Kevin Shanahan <kmshanah@ucwb.org.au>,
       Andrew Morton <akpm@linux-foundation.org>, a.p.zijlstra@chello.nl,
       torvalds@linux-foundation.org, linux-kernel@vger.kernel.org
In-Reply-To: <20090117160115.GA31601@elte.hu>
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	 <1232193617.14073.67.camel@laptop>
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	 <20090117044316.bda7d0bd.akpm@linux-foundation.org>
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Date: Sat, 17 Jan 2009 17:21:21 +0100
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On Sat, 2009-01-17 at 17:01 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.de> wrote:
> 
> > On Sat, 2009-01-17 at 04:43 -0800, Andrew Morton wrote:
> > > http://bugzilla.kernel.org/show_bug.cgi?id=12465 just popped up - another
> > > scheduler regression.  It has been bisected.
> > 
> > Seems pretty clear.  I'd suggest reverting it.
> 
> We can revert it (and will revert it if no solution is found), but i'd 
> also like to understand why it happens, because that kind of regression 
> from this change is unexpected - we might be hiding some bug that could 
> pop up under less debuggable circumstances, so we need to understand it 
> while we have a chance.

Agree.  However, with the sched_mc stuff, mysql+oltp now does better
with NEWIDLE on than off as well, as does an nfs kbuild.

	-Mike

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