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

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Message-ID: <p73fy2cz7bs.fsf@bingen.suse.de>
Date:	22 Aug 2007 03:28:07 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Christoph Lameter <clameter@....com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> writes:
> 
> The measurements I get (in cycles):
>              enable interrupts (STI)   disable interrupts (CLI)   local CMPXCHG
> IA32 (P4)    112                        82                         26
> x86_64 AMD64 125                       102                         19

What exactly did you benchmark here? On K8 CLI/STI are only supposed
to be a few cycles. pushf/popf might me more expensive, but not that much.

-Andi
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