linux-kernel - Re: Linux 2.6.32-rc1

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Message-ID: <20090930181357.637bf8ec@infradead.org>
Date:	Wed, 30 Sep 2009 18:13:57 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Linux 2.6.32-rc1

On Wed, 30 Sep 2009 17:57:25 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> Note:
> 
> lock; cmpxchg8b (%%esi)
> 
> gives 4 bytes opcode : f0 0f c7 0e
> Because alternative (call cmpxchg8b_emu) uses 5 bytes, a nop will be
> added.
> 
> Choosing ".byte 0xf0, 0x0f, 0xc7, 0x4e, 0x00"  aka "lock cmpxchg8b
> 0x0(%esi)" is a litle bit better ?

doesn't matter normally.. nops fall out quickly in the execution path ;)



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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