Messages in this thread | | | From | "Nicholas J. Leon" <> | Subject | Re: TCP/IP Checksumming | Date | Tue, 26 Nov 1996 20:35:30 -0500 (EST) |
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Heiko Schroeder was overheard whispering ... # Richard B. Johnson writes:
# OK, I just hacked a Linux version of a "test-suite" using the # cycle counter. (I'm using a Pentium Pro, so I can access the rdtsc # instruction in user code.) # # Here are the measured values for some of the functions used: # # csum_partial: sum = 1a8a, min cycles 1406 # csum_simple: sum = 1a8a, min cycles 6846 # csum_opt: sum = 1a8a, min cycles 2455 # csum_opt32: sum = 1a8a, min cycles 1434 # csum_c: sum = 1a8a, min cycles 2626 #
Hmmm. I just compiled and ran this suite and got the following:
csum_partial: sum = 1a8a, min cycles 674 csum_simple: sum = 1a8a, min cycles 8219 csum_opt: sum = 1a8a, min cycles 2286 csum_opt32: sum = 1a8a, min cycles 1235 csum_c: sum = 1a8a, min cycles 3494
This is on a 586/75. Could someone explain to me why the values would be so different than the before mentioned ones? For example, my csum_partial is almost 1/2 of csum_opt32, while Heiko's is like 98% of his csum_opt32.
N! ------------------------------------------------------------------------------ Nicholas J. Leon nicholas@binary9.net "Elegance through Simplicity" http://www.binary9.net/nicholas "You're just a Sega suicide, 16 bits, genocide."
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