Re: [tbench regression fixes]: digging out smelly deadmen.

[Stephen Hemminger]

Has anyone looked into the impact of port randomization on this benchmark.
If it is generating lots of sockets quickly there could be an impact:
  * port randomization causes available port space to get filled non-uniformly
    and what was once a linear scan may have to walk over existing ports.
    (This could be improved by a hint bitmap)

  * port randomization adds at least one modulus operation per socket
    creation. This could be optimized by using a loop instead.
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