[Dovecot] login_* options for 1.0.15

[Hugo Monteiro]

Hello all,

Although i'm aware that version 1.0.15 is rather old, that's what is 
used in Lenny, so...

Either way, the setup is rather simple, regular dovecot install, with 
maildirs residing on a "local" ext3 filesystem accessed through FC to a 
SAN (2Gbps link). The server has 2 cores (with HT), so "almost" 4 cores 
and 3GB of ram.

A couple weeks ago we had a major number of account migrations, from POP 
to IMAP. We started to notice that in times of peaks, specially after 
lunch hour, dovecot started to get REALLY slow and closing client 
connections. A restart to the service was enough to get things working 
again.

Firstly i thought about the max fd number per process, but after 
checking it turned out it was already rather large, 8192 in our case. I 
cannot observe any concerning I/O load either.

Besides upgrading, are there any suggestions?

Regards,

Hugo Monteiro.

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Hugo Monteiro
Email	 : hugo.monteiro at fct.unl.pt
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Web      : http://hmonteiro.net

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