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[tcpip] Add faster algorithm for calculating the TCP/IP checksum

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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>
This commit is contained in:
Michael Brown
2012-06-26 17:19:18 +01:00
parent bb9961fb54
commit ec22e08db1
2 changed files with 174 additions and 0 deletions
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5
src/arch/x86/include/bits/tcpip.h
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@@ -9,4 +9,9 @@
FILE_LICENCE ( GPL2_OR_LATER );
extern uint16_t x86_tcpip_continue_chksum ( uint16_t partial,
const void *data, size_t len );
#define tcpip_continue_chksum x86_tcpip_continue_chksum
#endif /* _BITS_TCPIP_H */