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From: Dave Jones <davej@suse.de>
To: Jean-Marc Saffroy <saffroy@ri.silicomp.fr>
Cc: <linux-kernel@vger.kernel.org>, <linux-smp@vger.kernel.org>
Subject: Re: [Q] Implementation of spin_lock on i386: why "rep;nop" ?
Date: Mon, 17 Sep 2001 18:22:33 +0200 (CEST)	[thread overview]
Message-ID: <Pine.LNX.4.30.0109171821340.27689-100000@Appserv.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.31.0109171725140.26090-100000@sisley.ri.silicomp.fr>

On Mon, 17 Sep 2001, Jean-Marc Saffroy wrote:

> What is the intent behind this "rep;nop" ? Does it really rely on an
> undocumented behaviour ?

Its used to stop Pentium 4's from cooking themselves.
See the P4 manuals for more info.

regards,

Dave.

-- 
| Dave Jones.        http://www.suse.de/~davej
| SuSE Labs


  reply	other threads:[~2001-09-17 16:22 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-09-17 16:16 [Q] Implementation of spin_lock on i386: why "rep;nop" ? Jean-Marc Saffroy
2001-09-17 16:22 ` Dave Jones [this message]
2001-09-17 17:19   ` Jean-Marc Saffroy
2001-09-17 16:42 ` Richard B. Johnson
2001-09-17 17:06   ` Jonathan Lundell
2001-09-17 17:27 ` Alan Cox
2001-09-17 19:47   ` H. Peter Anvin
2001-09-19  3:42   ` Jamie Lokier
2001-09-19  4:06     ` Brian Gerst

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