[PATCH] TCP Zero Copy for mmapped files

From: Thomas Ogrisegg (tom@rhadamanthys.org)
Date: Sun Dec 29 2002 - 20:09:53 EST

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The following patch (for 2.4.20 -- should work with all kernels
above 2.4.17) implements TCP Zero Copy for normal (writing)
socket operations on memory mapped files.

This is a major speedup for the TCP/IP stack (depending on the size
of the file more than 100% more throughput) and makes sendfile(2)
nearly useless.

BTW: When I did a (loopback) benchmark against my very own HTTP-
Server it outperformed TUX by roughly 6%. With logging disabled
by roughly 20%.

Please CC any replies to me, as I'm not subscribed to this list.

text/plain attachment: tcp.diff

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