From owner-freebsd-current Thu Jan 31 7:42:14 2002 Delivered-To: freebsd-current@freebsd.org Received: from mailhub.yumyumyum.org (dsl092-171-091.wdc1.dsl.speakeasy.net [66.92.171.91]) by hub.freebsd.org (Postfix) with SMTP id 3890D37B41A for ; Thu, 31 Jan 2002 07:42:06 -0800 (PST) Received: (qmail 21846 invoked by uid 1001); 31 Jan 2002 15:41:31 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 31 Jan 2002 15:41:31 -0000 Date: Thu, 31 Jan 2002 10:41:31 -0500 (EST) From: Kenneth Culver To: Terry Lambert Cc: David Malone , "Cameron, Frank" , "'freebsd-bugs@freebsd.org'" , "'freebsd-current@freebsd.org'" Subject: Re: AMD AGP Bug In-Reply-To: <3C593F22.977C00FD@mindspring.com> Message-ID: <20020131103927.A21783-100000@alpha.yumyumyum.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII 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 > There's actually a seperate TLB bug, but FreeBSD doesn't > trigger that one, either (Linux can tickle it, when there > are certain specific circumstances met). > Well, I think I know what you're talking about, linux allocates agpgart memory without setting a "non-cacheable" bit, and then the agp card writes to that memory, but the cpu cached it already, which makes the cache wrong or something like that, and causes the crashes/hangs. I know this is a greatly simplified version of the real problem, but I think this is a linux bug not necesarily an amd bug. Ken To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message