From: (no name) (no email)
Date: Sun Feb 01 2004 - 10:11:03 EST
On Sun, 1 Feb 2004, Luca Berra wrote:
> Is there any pratical difference in using
> XXXX_destination_concurrency_limit in main.cf versus filling the maxproc
> column for the XXXX transport in master.cf, i was tempted to use the
> former since it is easier to reconfigure.
>
If multiple destinations share the same transport, the process limit
controls the total number of delivery agents, not concurrent delivery
agents per destination (nexthop).
If the transport is dedicated to a single destination, there is no point
in having a process limit that is larger than the destination concurrency
limit.
It turns out that it can be useful to have a concurrency limit that is
much larger than the process limit, but only when delivering to nexthops
that are prone to return brief bursts of 421 errors or bursts of refused
connections, this is a workaround to a difficult design problem, that is
yet to be addressed, fortunately the problem is rare.
-- Viktor.
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