I was looking through the the databooks regarding PCI gart and I
noticed that r128, radeon, and r200 all do PCI gart the same way.  that
said, I also noticed that PCI GART is limited to 4 MB of system memory
when used with a PCI card and 32 MB when used with an AGP card.  I
haven't yet looked at the gart code in the radeon driver, but perhaps
it is trying to use more than 4 MB of system memory and that is causing
the slow down.  it may also explain why PCI gart seems to "work" on AGP
cards and older radeons, but not on newer PCI ones. On the other hand
perhaps the driver already takes care of this... I haven't checked.

Just a thought...

Alex


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