> 64-bit x86_64: > [ 0.509409] test_siphash: SipHash2-4 cycles: 4049181 > [ 0.510650] test_siphash: SipHash1-3 cycles: 2512884 > [ 0.512205] test_siphash: HalfSipHash1-3 cycles: 3429920 > [ 0.512904] test_siphash: JenkinsHash cycles: 978267
I'm not sure what these numbers mean. Surely a single siphash2-4 does not take 4+ million cycles? If you run them in a loop please divide by the iterations. But generally running small code in a loop is often an unrealistic benchmark strategy because it hides cache misses, primes predictors, changes frequencies and changes memory costs, but also can overload pipelines and oversubscribe resources. [see also page 46+ in http://halobates.de/applicative-mental-models.pdf] So the numbers you get there are at least somewhat dubious. It would be good to have at least some test which is not just a tiny micro benchmark to compare before making conclusions. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
