Subject: Re: [PATCH] remove dead cyrix/centaur mtrr init code
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Dave Jones <davej@redhat.com>
Cc: Andries Brouwer <Andries.Brouwer@cwi.nl>, torvalds@osdl.org, akpm@osdl.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mer, 2005-03-02 at 22:28, Dave Jones wrote:
> The winchips had a funky feature where you could mark system ram
> writes as out-of-order. This led to something like a 25% speedup iirc
> on benchmarks that did lots of memory copying. lmbench showed
> significant wins iirc, but any results I had saved are long since
> wiped out in hard disk failures/cruft removal over the years.

Yep - providing your kernel is built for it you get about 20-30% speed
up against a base kernel. It's the one freak case (in 2.4 anyway) where
kernel cpu options matter.

Alan

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