Connection Cache with randmap -- Transport Use Appears Random

[Greg Sims]

We are running with the Connection Cache enabled with the default settings and:

sender_dependent_default_transport_maps = randmap:{r235,r236,r237,r238}

Here are the number of emails we sent on each of the four transports
over a fixed interval of time:

   3,363 -- r235
   3,398 -- r236
   3,349 -- r237
   3,393 -- r238

We saw "conn_use=" in our logs 2,929 times over this same period --
this implies the Connection Cache was being used for 21.7% of the
emails sent.  If the Connection Cache has any impact on the random
selection of transports in the randmap, it is minor.

This date contradicts some recommendations on the Internet of turning
off the Connection Cache when randmap is used to "increase
randomness".

FYI, Greg
www.RayStedman.org