linux-kernel - Re: [PATCH] SLUB use cmpxchg

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Message-ID: <20070822093945.GA7539@one.firstfloor.org>
Date:	Wed, 22 Aug 2007 11:39:45 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

On Tue, Aug 21, 2007 at 06:06:19PM -0700, Christoph Lameter wrote:
> Ok. Measurements vs. simple cmpxchg on a Intel(R) Pentium(R) 4 CPU 3.20GHz 

Note the P4 is a extreme case in that "unusual" instructions are
quite slow (basically anything that falls out of the trace cache). Core2 
tends to be much more benign and generally acts more like a K8 in latencies.

There are millions and millions of P4s around of course and we
shouldn't disregard them, but they're not the future and not
highest priority.

-Andi
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