From owner-freebsd-current Thu Jan 31 19:23:49 2002 Delivered-To: freebsd-current@freebsd.org Received: from scaup.prod.itd.earthlink.net (scaup.mail.pas.earthlink.net [207.217.120.49]) by hub.freebsd.org (Postfix) with ESMTP id 3691437B404; Thu, 31 Jan 2002 19:23:46 -0800 (PST) Received: from pool0289.cvx40-bradley.dialup.earthlink.net ([216.244.43.34] helo=mindspring.com) by scaup.prod.itd.earthlink.net with esmtp (Exim 3.33 #1) id 16WUId-0006Re-00; Thu, 31 Jan 2002 19:23:39 -0800 Message-ID: <3C5A09F1.CD638C3E@mindspring.com> Date: Thu, 31 Jan 2002 19:22:25 -0800 From: Terry Lambert X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony} (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Peter Wemm Cc: Kenneth Culver , "Cameron, Frank" , David Malone , "'freebsd-bugs@freebsd.org'" , "'freebsd-current@freebsd.org'" Subject: Re: AMD AGP Bug References: <20020201022112.227833809@overcee.wemm.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Peter Wemm wrote: > We need to use the PAT cpu_features feature. This gives us 8 page attribute > modes instead of simple no-cache / writethrough flags. We can (and must) > control more carefully the speculative hardware prefetch, for example. > > I've been thinking about this with the pmap revamp that I'm working on. > It may solve the athlon problems too. This sounds cool. Do you have references to the page attribute stuff? The books I have here don't discuss it; the only thing I see are 3 bits (9,10,11) that are "available" in the PDE and PTE? -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message