> Do you know how horribly inefficient PIOs are?

If your system has a PATA disk, and your OS allows it, turning DMA off
will provide a very convincing demonstration.  (yeah disk != graphics,
but still...)

> Yeah.  What does AMD call it?  Iommu or something?

Most, perhaps all, 64 bit CPUs include an iommu.  I don't think
32 bit CPUs have them.
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