On Aug 12, 2015, at 11:25 AM, Chad M Stewart cms@balius.com wrote:
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Since I posted I've changed a couple of things: ulimit -n 8192, and disabled fsync as in mail_fsync = never. I'm not sure if I'll put it back in the LMTP section or not. Given all the hardware abstraction layers.
I forgot to mention that on a clean start of dovecot (after making those changes), I counted 25 msgs delivered to this single mailbox (all INBOX) in a second. Then it slowed down. Maybe the answer is less LMTP connections and increase the number of messages per connection. I have Postfix configured to do outbound connection caching and I've seen entries in the logs indicating 30 messages on a given connection. I'll have to look into how to limit dovecot to a certain number of LMTP processes.
-Chad