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You may remember that I have been complaining about long times
it takes for a dkim-milter (with Postfix) to sign long messages.
The mystery has now been explained, it is due to a deadlock
between a sender's Nagle algorithm and receivers's delayed ACK
policy. At each deadlock the session stalls for 0.1 seconds.
The problem is avoided in a sendmail setup because sendmail
uses larger buffer for sending mail contents to a milter,
which doesn't trigger TCP congestion avoidance mechanisms.
The problem is being addressed. See a thread starting at:
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