Michael> My guess was, an extra pass over data is likely to be
    Michael> expensive - dirtying the cache if nothing else. But I do
    Michael> plan to measure that, and see.

I don't get it -- where's the extra pass?  If you can't compute the
checksum on the NIC then you have to compute sometime it on the CPU
before passing the data to the NIC.

 - R.
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