On Wed, 2009-10-14 at 16:17 -0400, David Warden wrote: > To date, the only problem we have experienced is a seemingly random > but significant slowdown in Squirrelmail's loading of the messages in > a user's Inbox. Each time, I have been able to fix the problem by > deleting the user's dovecot.index, dovecot.index.cache and > dovecot.index.log files in the user's INDEX directory for their > dovecot Inbox.
First thing to try next time: Does it help if you only delete dovecot.index.cache file? How large is the cache file? And take a copy of the dovecot.index* files before doing that, I can then ask a few more questions about them. > I tried having users experiencing this problem log in to a test > Squirrelmail box with mail_debug on, but I didn't see anything out of > the ordinary and they report the same slowness on the test server. I > don't see anything but normal login/logout IMAP lines in the > production dovecot logs. mail_debug doesn't really help with performance debugging. > My first idea when I get > another one of these is to do a telnet IMAP session to Dovecot on one > of the Squirrelmail boxes and see if I can get it to slow down when > retrieving messages from the Inbox. That sounds like a good idea to try. And use the exact same IMAP commands as Squirrelmail to do it. strace -tt output of of the slow imap process could also show something interesting.
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