"John F. Woods" writes:
> Someone else mentioned that Linux uses a checksum-and-copy routine in its
> TCP/IP stack (and it wouldn't surprise me if the loopback interface was
> able to avoid doing the second checksum calculation at all); having added
> such to an OSF/1 based kernel, I can attest that if you have to copy the
> data at all, doing checksums at the same time is a serious performance
> improvement, even considering the effort you go through to unchecksum bytes
> here and there.

Checksum-and-copy is indeed a major win...

Perry