On Tue, 2003-11-25 at 00:45, Roland Scheidegger wrote:
>
> Results (AXP 1600, 9000pro, 1GB sdram, KT133A Chipset):
> glxgears QuakeIII (1024x768, graphic options all set to high)
> AGP 4x 1910 62.5
> AGP 1x 1860 61.1
> PCI 200 16.8
I've seen similarly pathetic PCI GART performance with newer chips on
Macs, but not with older chips (IIRC the M6 worked as expected, but not
M7 and M9; I thought this might be related to the L3 cache which was
added to PowerBooks at the same time). I basically see two possible
reasons:
* There's something about newer ATI AGP cards which makes them
perform very poorly with PCI GART
* Our drivers do something which makes newer chips perform very
poorly with PCI GART, be they AGP or PCI
The former wouldn't necessarily say anything about PCI cards, but I'm
not sure how to determine which it is (and what exactly the actual cause
is).
--
Earthling Michel DÃnzer | Debian (powerpc), X and DRI developer
Software libre enthusiast | http://svcs.affero.net/rm.php?r=daenzer
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