Again, the number of (smtpd+cleanup) processes during peak load
depends on the traffic volume and the time to service an SMTP client.
Apparently, your newer servers take more time to service an SMTP
client. Slow DNS can be one such cause. A file system with a slow
fsync() implementation can be another.
You need to find out what causes the DIFFERENCE in latencies of the
old and new servers. Translation: this involves measurements on
BOTH old and new servers.
The locks are a red herring. These are 'after the peak' processes
waiting for a client connection. Those proceses go away after a
timer goes off.
Wietse
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