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Message-ID: <Pine.LNX.4.64.0707091055090.16207@schroedinger.engr.sgi.com>
Date:	Mon, 9 Jul 2007 11:11:36 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Martin Bligh <mbligh@...gle.com>
cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 00/10] [RFC] SLUB patches for more functionality,
 performance and maintenance

On Mon, 9 Jul 2007, Martin Bligh wrote:

> Those numbers came from Mathieu Desnoyers (LTTng) if you
> want more details.

Okay the source for these numbers is in his paper for the OLS 2006: Volume 
1 page 208-209? I do not see the exact number that you referred to there.

He seems to be comparing spinlock acquire / release vs. cmpxchg. So I 
guess you got your material from somewhere else?

Also the cmpxchg used there is the lockless variant. cmpxchg 29 cycles w/o 
lock prefix and 112 with lock prefix.

I see you reference another paper by Desnoyers: 
http://tree.celinuxforum.org/CelfPubWiki/ELC2006Presentations?action=AttachFile&do=get&target=celf2006-desnoyers.pdf

I do not see anything relevant there. Where did those numbers come from?

The lockless cmpxchg is certainly an interesting idea. Certain for some 
platforms I could disable preempt and then do a lockless cmpxchg.
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