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Date: Thu, 08 May 2008 08:43:35 +0200 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> 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 Thu, 2008-05-08 at 13:20 +0800, Zhang, Yanmin wrote: > 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? The only thing similar is that it tries to to SMP load balancing for groups, other than that there is nothing similar - its a total rewrite with a whole different approach. And we _need_ an SMP load-balancer for groups - otherwise group scheduling is just not complete. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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