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

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Message-Id: <1262609854.9734.56.camel@marge.simson.net>
Date:	Mon, 04 Jan 2010 13:57:34 +0100
From:	Mike Galbraith <efault@....de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Lin Ming <ming.m.lin@...el.com>,
	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 04:40 -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)

My fault for using PREFER_SIBLING I guess.  However, I do wonder why in
the heck we set that at the CPU domain level.  Siblings lie northward.

	-Mike

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