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 Message-ID: <20020131204225.W258-100000@alpha.yumyumyum.org> In-Reply-To: <20020131173408.B63502@canonware.com>
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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 > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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