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    SubjectRe: iommu dma mapping alignment requirements
    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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      Last update: 2007-12-20 22:05    [W:0.041 / U:29.552 seconds]
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