Re: Efficient x86 and x86_64 NOP microbenchmarks

[Steven Rostedt]

Just a curious run of Mathieu's micro benchmark:

NR_TESTS 10000000
                      test empty cycles : 182500444
               test 2-bytes jump cycles : 195969127
               test 5-bytes jump cycles : 197000202
                   test 3/2 nops cycles : 201333408
test 5-bytes nop with long prefix cycles : 205000067
             test 5-bytes P6 nop cycles : 205000227
   test Generic 1/4 5-bytes nops cycles : 200000077
        test K7 1/4 5-bytes nops cycles : 197549045


And this was on a Pentium III 847.461 MHz box (my old toshiba laptop)

The jumps here played the best, but that could just be cache issues. But 
interesting to see that of the nops, the K7 1/4 faired the best.

-- Steve

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