Benjamin Herrenschmidt wrote:
Adding A few more people to the discussion. You may well be right and we would have to provide the same alignment, though that sucks a bit as one of the reason we switched to 4K for the IOMMU is that the iommu space available on pSeries is very small and we were running out of it with 64K pages and lots of networking activity.
But smarter NIC drivers can resolve this too, I think, but perhaps carving up full pages of mapped buffers instead of just assuming mapping is free...
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