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

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Message-Id: <1262659483.5748.0.camel@marge.simson.net>
Date:	Tue, 05 Jan 2010 03:44:43 +0100
From:	Mike Galbraith <efault@....de>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	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 Tue, 2010-01-05 at 08:44 +0800, Lin Ming wrote:
> 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.

Excellent.  Thanks for testing.

	-Mike

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