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
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