From owner-freebsd-current  Thu Jan 31 17:42:57 2002
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Date: Thu, 31 Jan 2002 20:42:47 -0500 (EST)
From: Kenneth Culver <culverk@yumyumyum.org>
To: Jason Evans <jasone@canonware.com>
Cc: =?iso-8859-1?Q?G=E9rard_Roudier?= <groudier@free.fr>,
	"Cameron, Frank" <Cameron@ctc.com>,
	Terry Lambert <tlambert2@mindspring.com>,
	David Malone <dwmalone@maths.tcd.ie>,
	"'freebsd-current@freebsd.org'" <freebsd-current@FreeBSD.ORG>
Subject: Re: AMD AGP Bug
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I was under the impression that they were writing into the cache not out
of it... I really need to read that article again :-D

Ken

On Thu, 31 Jan 2002, Jason Evans wrote:

> On Wed, Jan 30, 2002 at 11:14:48PM +0100, G=E9rard Roudier wrote:
> >
> > Linux can be fixed, but the useless writes of the existing Athlons from
> > the very fast cache to the relatively very slow memory cannot. And all
> > Athlon users may well pay this penalty under any OS...  unless we want =
to
> > disable caching. :)
>
> Have you done benchmarks to show that the speculative writes are useless
> often enough to cause enough memory bus contention that overall performan=
ce
> is degraded, despite the speedups when the speculative writes are valid? =
 I
> suspect that AMD in fact performed such tests; otherwise they wouldn't ha=
ve
> gone to the trouble of implementing speculative writes.
>
> Jason
>
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