Re: volanoMark regression with kernel 2.6.26-rc1

Dhaval Giani
2008-05-07T17:34:29Z

On Tue, May 06, 2008 at 05:22:07PM +0530, Dhaval Giani wrote:
> On Tue, May 06, 2008 at 10:06:30AM +0800, Zhang, Yanmin wrote:
> > Comparing with 2.6.25, volanoMark has big regression with kernel 2.6.26-rc1.
> > It's about 50% on my 8-core stoakley, 16-core tigerton, and Itanium Montecito.
> >
> > With bisect, I located below patch.
> >
> > 18d95a2832c1392a2d63227a7a6d433cb9f2037e is first bad commit
> > commit 18d95a2832c1392a2d63227a7a6d433cb9f2037e
> > Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
> > Date: Sat Apr 19 19:45:00 2008 +0200
> >
> > sched: fair-group: SMP-nice for group scheduling
> >
> > Implement SMP nice support for the full group hierarchy.
> >
> > If I reverse the patch with resolving some conflictions, volanoMark result could
> > be restored completely.
> >
>
> ok, that's bad. Let's get vatsa and Ingo also involved.
>

Just to confirm, do you still have a performance regression with
!group_sched?

--
regards,
Dhaval