linux-kernel - Re: volanoMark regression with kernel 2.6.26-rc1

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Message-Id: <1210224012.3453.105.camel@ymzhang>
Date:	Thu, 08 May 2008 13:20:12 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: volanoMark regression with kernel 2.6.26-rc1


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@...ux.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


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