On Wed, 1 May 2002, Kees Cook wrote:
>I've finally had a chance to upgrade to XFree86 4.2.0, and am trying out
>the bleeding edge builds for mach64. :)
>
>Quick version: it doesn't work.
>
>Long version: I think I have an AGP problem.
>
>glxinfo reports that direct rendering is off.
>the mach64 kernel driver compiled and is loaded, but agpgart errors out:
>
>mtrr: Serverworks LE detected. Write-combining disabled.
^^^^^^^^^^^^^^
Ick. Problem #1
>mtrr: your processor doesn't support write-combining
Problem #2
>I'm at a loss! (And unfortunately, the ati driver is REALLY slow for just
>regular 2D stuff. I can watch things repaint, etc. Wasn't like that in
>XFree86 4.1.0...)
Yep, you're not likely to see it get any better either
unfortunately. Serverworks chipsets have an off by one problem
in hardware with MTRR being used (if I've got the story I was
told by Alan Cox correct), and as such MTRR is not available as
it is purposefully disabled to prevent data corruption. That
significantly slows down graphics.
Also... AGP on Serverworks _sucks_. I strongly recommend against
using Serverworks chipsets for any machines used for graphics.
"Server" being the operative word for the chipset. ;o) If they
were called Graphicsworks perhaps it would work better. ;o)
>What should I do next?
Replace the motherboard with a chipset that has a working AGP
implementation which both works, and is fast, and also has
working MTRR support.
Using Radeon with DRI on my Serverworks boards, with dual 1Ghz
P-III Xeon CPU's, and 1Gb of RAM, I can watch the screen paint
from top to bottom when switching windows - it takes about 1
second to paint the screen. This is in my case due to the Radeon
CP engine 2D acceleration not accelerating everything it does in
MMIO mode.
That latter part wont affect you on Mach64 though likely.
Bad news.. ;o(
--
Mike A. Harris Shipping/mailing address:
OS Systems Engineer 190 Pittsburgh Ave., Sault Ste. Marie,
XFree86 maintainer Ontario, Canada, P6C 5B3
Red Hat Inc.
http://www.redhat.com ftp://people.redhat.com/mharris
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