Cyrus lagging accepting IMAP connections

[Scott M. Likens]

Rick,

This problem is related to Debian using /dev/random instead of /dev/urandom.

Short term solution would be to rm /dev/random

mknod /dev/random c 1 9

The other solution for you would be to recompile the sources and change
the configure to use urandom instead of random... You can search the
archives and search for urandom on how to do that.

Scott

Rick Kunkel wrote:
> Hello all,
>
> I'm new to Cyrus.  Historically, I've used Qpopper, Sendmail, and UW IMAP. 
> We recently switched to Cyrus for IMAP.  It came highly recommended...
>
> We've got this on a darned burly machine, running some very recent version 
> of Debian, with a fast CPU, 4GB RAM, and fast SAS drives.  When testing 
> the thing, before it went into production, everything worked awesomely. 
> However, having loaded it with 2300 users, it's suddenly acting 
> erratically.  (Incidentally, of the 2300 users, almost all are POP users, 
> which seems to be working fine.  A few hundred -- at most -- are IMAP, and 
> they are split between squirrelmail users and a handful that use standard 
> MUAs.)
>
> The server acts as if it's low on resources or something, or has hit some 
> kind of connection limit.  It's speedy as heck WHEN it does it what's it's 
> supposed to, but that initial connection is sketchy.  For the first 30 
> seconds after you restart it, it's generally good, but it goes downhill 
> from there.
>
> Testing with telnet exhibits this behavior.  Here's a sample session...
>
> # telnet mail 143
> Trying xxx.xxx.xxx.xxx...
> Connected to mail.
> Escape character is '^]'.
>
>
> And then it just kinda sits.  Sometimes, after 30 seconds or so
>
> * OK mail Cyrus IMAP4 v2.2.13-Debian-2.2.13-10 server ready
>
>
> We're currently using the following line in cyrus.conf for imapd:
>
> imap	cmd="imapd" listen="imap" prefork=1
>
>
> We've messed with tons of different settings here, to little avail.
>
> There don't seem to be any salient log entries.
>
> Anyone have any ideas?
>
> Thanks,
>
> Rick Kunkel
> ----
> Cyrus Home Page: http://cyrusimap.web.cmu.edu/
> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
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>
>
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