On 03/02/2017 07:02 PM, Jonathan Morton wrote: >> On 3 Mar, 2017, at 01:55, John Yates <j...@yates-sheets.org> wrote: >> >> The virtue of a prime number of buckets is that when you mod >> your 32-bit hash value to get a bucket index you harvest _all_ >> of the entropy in the hash, not just the entropy in the bits you >> preserve. > True, but you incur the cost of a division, which is very much non-trivial on > ARM CPUs, which are increasingly common in CPE. > > - Jonathan Morton Also with SQM you may not what idealized entropy in your queue distribution. It is desired by some to have host-connection fairness, and not so much interest in stream-type fairness. So overlap in a few hash "tags" may not be always such a bad thing depending on how it works itself out.
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