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    SubjectRe: PATCH: Further aacraid work
    On Thu, Jun 17, 2004 at 09:10:43PM +0200, Andi Kleen wrote:
    > The AMD64 IOMMU could do it too (and the code to do it exists in
    > 2.6). But the problem is that the current IO layer doesn't provide a
    > sufficient fallback path when this fails. You have to promise in
    > advance that you can merge and then later it's too late to change your
    > mind without signalling an IO error.

    I would rather see it below the I/O layer for things like AMD64. The
    reason I say this is that many drivers would suffer from iommu merging not
    gain, and others may have limits.

    Something like

    new_sglist = sg_squash(old_sglist, [target max segments], [max per seg])

    could be used by drivers when appropriate to hand back a better sg list
    (or if not possible the existing one). That would put control rather closer
    to the driver.


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