linux-kernel - Re: [patch 00/10] [RFC] SLUB patches for more functionality, performance and maintenance

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Message-ID: <46925B5D.8000507@google.com>
Date:	Mon, 09 Jul 2007 08:59:25 -0700
From:	Martin Bligh <mbligh@...gle.com>
To:	Christoph Lameter <clameter@....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

Christoph Lameter wrote:
> On Sun, 8 Jul 2007, Andi Kleen wrote:
> 
>> Christoph Lameter <clameter@....com> writes:
>>
>>> A cmpxchg is less costly than interrupt enabe/disable
>> That sounds wrong.
> 
> Martin Bligh was able to significantly increase his LTTng performance 
> by using cmpxchg. See his article in the 2007 proceedings of the OLS 
> Volume 1, page 39.
> 
> His numbers were:
> 
> interrupts enable disable : 210.6ns
> local cmpxchg             : 9.0ns

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

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