Date: Thu, 31 Jan 2002 17:34:08 -0800 From: Jason Evans <jasone@canonware.com> To: =?iso-8859-1?Q?G=E9rard_Roudier?= <groudier@free.fr> Cc: Kenneth Culver <culverk@yumyumyum.org>, "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 Message-ID: <20020131173408.B63502@canonware.com> In-Reply-To: <20020130225003.C2570-100000@gerard>; from groudier@free.fr on Wed, Jan 30, 2002 at 11:14:48PM %2B0100 References: <20020131135127.V22577-100000@alpha.yumyumyum.org> <20020130225003.C2570-100000@gerard>
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On Wed, Jan 30, 2002 at 11:14:48PM +0100, Gérard 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 performance is degraded, despite the speedups when the speculative writes are valid? I suspect that AMD in fact performed such tests; otherwise they wouldn't have gone to the trouble of implementing speculative writes. Jason To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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