>>> In case of openvswitch it shows a performance improvment. The seed >>> parameter could be used as an initial biasing of the crc32 function, but >>> in case of openvswitch it is only set to 0. >> NACK. [...]
> Sorry for being unclear, I understood that and didn't bother patching > that '0' with a random seed exactly because of this. And I'm sorry for delivering a long lecture on a subject you already understood perfectly well. I'd just been thinking about it because of Herbert's comments, so it was conveniently at hand. :-) Out of curiousity, what *were* you referring to when you talked about biasing the crc32 function? "Biasing" is a good term becuase it just applies an offset, but what do you gain from doing that? There are nifty things one can do with the CRC32 instruction, however. A lot of ciphers these days use an ARX (add, rotate, XOR) kernel. A crc32 instruction, although linear, does some very powerful rotate & xor operations, and could replace the XOR and rotate. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
