Andrew Gallatin wrote:
> 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?
>
I don't know. I still run into a fair bit of devices, though I admit
they aren't 10GbE. (Most of the audio devices -- even Azalia devices --
and SDcard controllers I've dealt with don't support DAC, for example.)
- Garrett
> Drew
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>
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