linux-kernel - Re: Intel Memory Ordering White Paper

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Date:	Sat, 8 Sep 2007 12:19:43 +0200
From:	Andi Kleen <ak@...e.de>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Intel Memory Ordering White Paper

On Friday 07 September 2007 21:57:35 Nick Piggin wrote:

> 
> > > Anyway, the lfence should be able to go away without so much trouble.
> >
> > You mean sfence? lfence in rmb is definitely needed.
> 
> I mean lfence in smp_rmb().

One point of rmb is to stop speculative loads and I don't think we 
can get that without lfence.

-Andi

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