linux-kernel - Re: LFENCE instruction (was: [rfc][patch 3/3] x86: optimise barriers)

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Message-ID: <471401AF.4090802@zytor.com>
Date:	Mon, 15 Oct 2007 17:11:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: LFENCE instruction (was: [rfc][patch 3/3] x86: optimise barriers)

Mikulas Patocka wrote:
> 
> I know about unordered stores (movnti & similar) --- they basically use 
> write-combining method on memory that is normally write-back --- and they 
> need sfence. But which one instruction does unordered load and needs 
> lefence?
> 

PREFETCHNTA.

	-hpa
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