Date: Fri, 15 May 1998 22:46:37 +1000 From: David Dawes <dawes@rf900.physics.usyd.edu.au> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: dyson@FreeBSD.ORG, sos@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: People having problems with X windows? Message-ID: <19980515224637.08480@rf900.physics.usyd.edu.au> In-Reply-To: <2028.895222610@critter.freebsd.dk>; from Poul-Henning Kamp on Fri, May 15, 1998 at 10:56:50AM %2B0200 References: <199805150738.CAA03075@dyson.iquest.net> <2028.895222610@critter.freebsd.dk>
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On Fri, May 15, 1998 at 10:56:50AM +0200, Poul-Henning Kamp wrote: >In message <199805150738.CAA03075@dyson.iquest.net>, "John S. Dyson" writes: > >>I just removed my WC "improvements", by adding the return to the >>subroutine in the pmap code. See if it is more friendly. The >>symptoms appear to be those associated with improper setting of >>WC mode for a display adaptor. I had to add a heuristic to make >>it work correctly on one of my cards, but I guess it was bad. >> >>The code is still in there, but I guess there is the need for more >>research into the issue. > >I would expect WC to break any and all accelerated adapters that >communicate with the graphics engine through the ram window... For PCI cards, memory windows used for MMIO shouldn't be marked pre-fetchable. Memory windows that are purely for framebuffer use could be. >What is needed is to XFree86 to be able to madvise the true frame >buffer as "Write-combine" and leave the rest of the ram window >unaffected. Having such a mechanism would be useful. David To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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