linux-kernel - Re: volano ~30% regression with 2.6.33-rc1 & -rc2

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Message-Id: <1262652299.22471.117.camel@minggr.sh.intel.com>
Date:	Tue, 05 Jan 2010 08:44:59 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: volano ~30% regression with 2.6.33-rc1 & -rc2

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@...el.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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