From: Martin Bligh <mbligh@google.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch 00/10] [RFC] SLUB patches for more functionality, performance and maintenance
Date: Mon, 09 Jul 2007 08:59:25 -0700 [thread overview]
Message-ID: <46925B5D.8000507@google.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0707090845520.13792@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
> On Sun, 8 Jul 2007, Andi Kleen wrote:
>
>> Christoph Lameter <clameter@sgi.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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next prev parent reply other threads:[~2007-07-09 15:59 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070708034952.022985379@sgi.com>
[not found] ` <p73y7hrywel.fsf@bingen.suse.de>
2007-07-09 15:50 ` Christoph Lameter
2007-07-09 15:59 ` Martin Bligh [this message]
2007-07-09 18:11 ` Christoph Lameter
2007-07-09 21:00 ` Martin Bligh
2007-07-09 21:44 ` Mathieu Desnoyers
2007-07-09 21:55 ` Christoph Lameter
2007-07-09 22:58 ` Mathieu Desnoyers
2007-07-09 23:08 ` Christoph Lameter
2007-07-10 5:16 ` [PATCH] x86_64 - Use non locked version for local_cmpxchg() Mathieu Desnoyers
2007-07-10 20:46 ` Christoph Lameter
2007-07-10 0:55 ` [patch 00/10] [RFC] SLUB patches for more functionality, performance and maintenance Christoph Lameter
2007-07-10 8:27 ` Mathieu Desnoyers
2007-07-10 18:38 ` Christoph Lameter
2007-07-10 20:59 ` Mathieu Desnoyers
2007-08-13 22:18 ` Mathieu Desnoyers
2007-08-13 22:28 ` Christoph Lameter
[not found] ` <20070708035018.074510057@sgi.com>
[not found] ` <20070708075119.GA16631@elte.hu>
[not found] ` <20070708110224.9cd9df5b.akpm@linux-foundation.org>
[not found] ` <4691A415.6040208@yahoo.com.au>
[not found] ` <84144f020707090404l657a62c7x89d7d06b3dd6c34b@mail.gmail.com>
2007-07-09 16:08 ` [patch 09/10] Remove the SLOB allocator for 2.6.23 Christoph Lameter
2007-07-10 8:17 ` Pekka J Enberg
2007-07-10 8:27 ` Nick Piggin
2007-07-10 9:31 ` Pekka Enberg
2007-07-10 10:09 ` Nick Piggin
2007-07-10 12:02 ` Matt Mackall
2007-07-10 12:57 ` Pekka J Enberg
2007-07-10 22:12 ` Christoph Lameter
2007-07-10 22:40 ` Matt Mackall
2007-07-10 22:50 ` Christoph Lameter
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