Subject: Re: volano ~30% regression with 2.6.33-rc1 & -rc2
From: Lin Ming <ming.m.lin@intel.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>, Peter Zijlstra <peterz@infradead.org>,
       lkml <linux-kernel@vger.kernel.org>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
In-Reply-To: <20100104044024.5390ff1c@infradead.org>
References: <1262592958.22471.104.camel@minggr.sh.intel.com>
	 <20100104044024.5390ff1c@infradead.org>
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Date: Tue, 05 Jan 2010 08:44:59 +0800
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On Mon, 2010-01-04 at 20:40 +0800, Arjan van de Ven wrote:
> On Mon, 04 Jan 2010 16:15:58 +0800
> Lin Ming <ming.m.lin@intel.com> wrote:
> 
> > Mike & Peter,
> > 
> > Compared with 2.6.32, volano has ~30% regression with 2.6.33-rc1 &
> > -rc2. Testing machine: Tigerton Xeon, 16cpus(4P/4Core), 16G memory
> 
> did this show up only on this cpu?
> (since this is a multi-core-without-shared-cache cpu, it could be that
> we get the topology wrong and think cores share cache where they don't)

Tulsa machine(16cpus, 4P/2Core/HT) also has ~8% regression
and it's now fixed by Mike's patch.

Lin Ming

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