Re: volanoMark regression with kernel 2.6.26-rc1

Zhang, Yanmin
2008-05-08T05:21:34Z

On Wed, 2008-05-07 at 19:34 +0200, Peter Zijlstra wrote:
> On Wed, 2008-05-07 at 11:17 +0200, Ingo Molnar wrote:
> > * Zhang, Yanmin <yanmin_zhang@linux.intel.com> 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.
> >
> > thanks Yanmin, i've queued up your patch that reverts this change.
>
> Is this really needed now that GROUP_SCHED defaults to 'n' ?
>
> Yanmin, this is with GROUP_SCHED=y, right or is this without?
With GROUP_SCHED=y.

I remember a similiar patch was merged into 2.6.25-rc1 and I found the similiar volanoMark
regression, then you reverted it. Why to add it back to 2.6.26-rc1?

-yanmin