Hi, I had been taking a look at the strace output myself, and found that adding 'mmap_disable = yes' to dovecot.conf makes the performance problems go away.
HTH, -- Fun will now commence -- Seven Of Nine, "Ashes to Ashes", stardate 53679.4 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]