[ext] 2.3.7 slower than 2.3.6?

[Ralf Hildebrandt]

* Ralf Hildebrandt via dovecot <dovecot at dovecot.org>:
> We're using dovecot (via LMTP) as a backup for all incoming mail.
> 
> I upgraded from 2.3.6 to 2.3.7 on the 12th:
> 2019-07-12 14:35:44 upgrade dovecot-imapd:amd64 2:2.3.6-2~bionic 2:2.3.7-8~bionic
> 
> and it seems that 2.3.7 is slower than 2.3.6 -- mail to the backup
> IMAP box is suddenly taking quite some time to get delivered and is piling up
> in the queue.

And alas, I had a look at the monitoring and found that disk IO has
increase A LOT after the update: https://www.arschkrebs.de/images/dovecot-disk-io-increase.png

I zoomed in and found that the sudden increace in IO coincides with
the update to 2.3.7 (14:35): https://www.arschkrebs.de/images/dovecot-io-2.png

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | https://www.charite.de