[Dovecot] "Out of memory" error in 1.0alpha3

[Sergey A. Lipnevich]

Hi All,

I have Dovecot 1.0 Alpha3 running on x86_64 Linux 2.6 multi-CPU box 
using Maildir folders. Moving messages from one folder to another in 
Thunderbird 1.0.7, regardless of their size (usually small), produced 
error 83, "Out of memory", when both of these parameters were unset 
(default): mail_read_mmaped, mmap_disable. The log line before the error 
was pool_system_malloc(): Out of memory.
I initially changed mmap_disable to "yes", the error stopped, but it 
still wasn't moving messages reliably. I then set MM parameters more 
aggressively: mail_read_mmaped = yes, mmap_disable = no (and the third 
of the series, mmap_no_write, is left unset). The error stopped popping 
up, and the moving works speedily.
Maybe the default for mail_read_mmaped should be "yes?"
Thank you!

Sergey.