On Mon, Dec 1, 2014 at 3:05 PM, Alex Elsayed <eternal...@gmail.com> wrote: > hard evidence shows that SHA-1 was equal to or faster than CRC32, which is > unequivocally simpler and faster than CityHash (though CityHash comes > close). > > And the CPUs in question are *not* particularly rare - Intel since Sandy > Bridge or so, the majority of SPARC systems, a goodly number of ARM systems > via coprocessors...
By the way, your "hard evidence" is imaginary. Here you can see that SHA-1 is about 5 cycles per byte on Sandybridge: https://blake2.net/ While SpookyHash (and CityHash) are about 3 bytes per cycle (on long keys) which is about 0.33 cycles per byte. More than 10 times faster than SHA-1. http://burtleburtle.net/bob/hash/spooky.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
