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    SubjectRe: memcpy_toio on i386 using byte writes even when n%2==0
    H. Peter Anvin wrote:
    > For something that generates I/O transactions, it's imperative to
    > generate the smallest possible number of transactions. Furthermore,
    > smaller than dword transactions aren't burstable, except at the
    > beginning and end of a burst.

    Well, theoretically for writes they could be, if the memory region was
    prefetchable and the PCI chipset supported byte merge. It certainly
    isn't optimal however.

    --
    Robert Hancock Saskatoon, SK, Canada
    To email, remove "nospam" from hancockr@nospamshaw.ca
    Home Page: http://www.roberthancock.com/

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