From owner-freebsd-current Sat Oct 30 22:55:46 1999 Delivered-To: freebsd-current@freebsd.org Received: from cain.gsoft.com.au (genesi.lnk.telstra.net [139.130.136.161]) by hub.freebsd.org (Postfix) with ESMTP id C90A014C24; Sat, 30 Oct 1999 22:55:38 -0700 (PDT) (envelope-from doconnor@gsoft.com.au) Received: from cain.gsoft.com.au (doconnor@cain [203.38.152.97]) by cain.gsoft.com.au (8.8.8/8.8.8) with ESMTP id QAA06872; Sun, 31 Oct 1999 16:25:30 +1030 (CST) (envelope-from doconnor@gsoft.com.au) Message-ID: X-Mailer: XFMail 1.3.1 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Sun, 31 Oct 1999 16:25:30 +0930 (CST) From: "Daniel O'Connor" To: Andrew Atrens Subject: Re: K6-III wrtalloc + mtrr support ? Cc: current@freebsd.org, Brian Fundakowski Feldman Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 30-Oct-99 Andrew Atrens wrote: > I remember this now, I was one of those that got bit by this problem. What > I recall is that MTRR support made a dramatic speed improvement, but alas > was _extremely_ unstable. That was when I had an ATI Expert@Work card. > Since then I've gotten a 3dfx Voodoo3, perhaps this card might be more > stable? So Brian, how do I switch this back on ? Well.. I think it depends on the video card.. For example I had a Matrox Millenium II and turning write-combining on worked fine.. No stability or video glitch problems.. I got a TNT2 and tried it.. Not so lucky. It would cause video to glitch badly.. If I just disabled caching for the video cards region it was fine though. I suspect that since the x server feeds commands to the card via a memory mapped region turning write combing hosed its ability to send the commands in the correct order. I suppose I could fiddle with it and find out how big the command window but I haven't bothered yet. --- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message