Messages in this thread | | | Date | Thu, 20 Dec 2007 15:02:06 -0600 | From | Steve Wise <> | Subject | Re: iommu dma mapping alignment requirements |
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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...
perhaps...
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