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2 Commits (ec22e08db1fa61f5276b2ed1efbde28a1a45101e)

Author SHA1 Message Date
Michael Brown ec22e08db1 [tcpip] Add faster algorithm for calculating the TCP/IP checksum 
The generic TCP/IP checksum implementation requires approximately 10
CPU clocks per byte (as measured using the TSC).  Improve this to
approximately 0.5 CPU clocks per byte by using "lodsl ; adcl" in an
unrolled loop.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 2012-06-28 16:02:31 +01:00
Michael Brown 1d77d03216 [tcpip] Allow for architecture-specific TCP/IP checksum routines 
Calculating the TCP/IP checksum on received packets accounts for a
substantial fraction of the response latency.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 2012-06-27 19:15:17 +01:00