linux-kernel - Re: [git pull] scheduler fixes

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Message-Id: <1232209281.5987.4.camel@marge.simson.net>
Date:	Sat, 17 Jan 2009 17:21:21 +0100
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>, Kevin Shanahan <kmshanah@...b.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] scheduler fixes

On Sat, 2009-01-17 at 17:01 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@....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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