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Date: Wed, 19 Sep 2001 19:55:00 +0100
From: Arjan van de Ven <arjanv@redhat.com>
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To: Dan Hollis <goemon@anime.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Athlon bug stomper. Pls apply.
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Dan Hollis wrote:
> 
> On Wed, 19 Sep 2001, Linus Torvalds wrote:
> > It is _probably_ an undocumented performance thing, and clearing that
> > bit may slow something down. But it might also change some behaviour,
> > and knowing _what_ the behaviour is might be very useful for figuring
> > out what it is that triggers the problem.
> 
> AFAIK noone has even tested it yet to see what it does to performance! Eg
> it might slow down memory access so that athlon-optimized memcopy is now
> slower than non-athlon-optimized memcopy. And if it turns out to be the
> case, we might as well just use the non-athlon-optimized memcopy instead
> of twiddling undocumented northbridge bits...

Ok but that part is simple:

run

http://www.fenrus.demon.nl/athlon.c

.....