Garrett D'Amore wrote:
> Of course, it also requires that the buffers be mapped somewhere in low
> physical address space, or you have to have a driver that can address
> the entire region of physical memory (i.e. 64-bit support on the
> adapter) to avoid the use of bounce buffers on systems without IOMMU
> capability.
PCI has had DAC for something over a decade now. How
much PCI{,-X,-e} hardware is still limited to a 32-bit
address space? Especially hardware which is fast enough
to for zero-copy to matter?
Drew
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