Re: [git pull] scheduler fixes

Mike Galbraith
2009-01-17T16:21:37Z

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