[Cake] [LEDE-DEV] Cake SQM killing my DIR-860L - was: [17.01] Kernel: bump to 4.4.51

[Eric Luehrsen]

On 03/02/2017 07:02 PM, Jonathan Morton wrote:
>> On 3 Mar, 2017, at 01:55, John Yates <john at 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.