linux-kernel - Re: aim7 scalability issue on 4 socket machine

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Message-ID: <Pine.LNX.4.64.0909180742500.14561@sister.anvils>
Date:	Fri, 18 Sep 2009 07:53:58 +0100 (BST)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>,
	"lee.schermerhorn@...com" <lee.schermerhorn@...com>
Subject: Re: aim7 scalability issue on 4 socket machine

On Thu, 17 Sep 2009, Andrew Morton wrote:
> On Fri, 18 Sep 2009 10:02:19 +0800 "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> wrote:
> > > 
> > > So, Yanmin, please retest with http://lkml.org/lkml/2009/9/13/25
> > > and let us know if that works as well for you - thanks.
> > I tested Lee's patch and it does fix the issue.

Thanks for checking and reporting back, Yanmin.

> 
> Do we think we should cook up something for -stable?

Gosh, I laughed at Lee (sorry!) for suggesting it for -stable:
is stable really for getting a better number out of a benchmark?

I'd have thought the next release is the right place for that; but
I've no problem if you guys and the stable guys agree it's appropriate.

> 
> Either this is a regression or the workload is particularly obscure. 

I've not cross-checked descriptions, but assume Lee was actually
testing on exactly the same kind of upcoming Nehalem as Yanmin, and
that machine happens to have characteristics which show up badly here.

> 
> aim7 is sufficiently non-obscure to make me wonder what's happened here?

Not a regression, just the onward march of new hardware, I think.
Could easily be other such things in other places with other tests.

Hugh
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