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almost
on Oct 13, 2010
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SSE4.2 and the new CRC32 instruction
I forgot about TCPs use of CRC32. Still, I wonder if the time spent in CRC32 is a noticeable fraction of the total time. I guess it must be in some situations, otherwise why would they put it in the chip...
dfox
on Oct 13, 2010
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That might be caused by the fact, that TCP does not use CRC, but it's own checksum algorithm (faster, less relaible).
vilda
on Oct 13, 2010
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...and very often is calculated by network card itself and left blank by OS. (See checksum errors in wireshark.)
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