Matthew Jacob wrote:
And actually, it's 100% impossible to do a transfer larger than 2^32 on
PCI Express due to the protocol requiring that a transfer not cross a
4GB boundary.
You could still have a device that you program with > 2^32 and it'll
take care of the segment issues.
So, I think that we are pretty safe with this typedef for
the next 5-10 years.
Nope. I give it 3 years max.
Of course, I'll be honored when Linus calls me a
moron for this 7 years from now =-)
Scott
Oh, I'm sure that you could contrive a silly device today to prove your
point. But really, what are you going to do other than DMA completely
randomly-associated memory pages that just happen to neighbor each
other? It's not like the kernel or any user process can own more than
4GB of memory on i386+PAE.
Scott
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