Date: Sun, 31 Oct 1999 16:25:30 +0930 (CST) From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Andrew Atrens <atrens@nortelnetworks.com> Cc: current@freebsd.org, Brian Fundakowski Feldman <green@FreeBSD.org> Subject: Re: K6-III wrtalloc + mtrr support ? Message-ID: <XFMail.991031162530.doconnor@gsoft.com.au> In-Reply-To: <Pine.BSF.4.20.9910301334290.68077-100000@hcarp00g.ca.nortel.com>
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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
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