On Maw, 2003-11-25 at 20:26, Michel DÃnzer wrote:
* 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).
Is there code reading from PCI space as it builds stuff or uploads textures. Anything that ends up doing
*pciaddr=foo [blah] if(x) *pciaddr|=FOOFLAG;
kills your performance on PCI bus.
I'm pretty sure that anything that did that for PCI would also do it for AGP. I assume that would kill performance even more, yes?
Could somebody with an actual PCI card try this with ATI's driver? If the performance is okay there, that will point the finger at our driver rather than the hardware. If the performance is horrible there, that will point the finger at the hardware. :)
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