Hello,
I am no programmer at all. I have dovecot set up on two very similar
machines. On one of the boxes, the dovecot server has recently been
showing slower response times. It feels slower. Where it is slower,
dovecot works as an auth server for postfix. I have replaced exim with
postfix on that box and I think since then dovecot started to slow down.
On the other machine the MTA is exim.
I'd like to ask how to go about debugging the problem. Neither machine
serves many users, the one that is slower has currently only two. It's a
home setup really.
Here's the output of dovecot -n
# 1.0.5: /usr/local/etc/dovecot.conf
protocols: imap imaps pop3 pop3s
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
login_greeting: Server ready.
verbose_proctitle: yes
first_valid_uid: 125
first_valid_gid: 125
mail_extra_groups: mail
mail_location: maildir:/usr/local/virtual/%d/%n
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
imap_client_workarounds(default): delay-newmail outlook-idle
netscape-eoh tb-extra-mailbox-sep
imap_client_workarounds(imap): delay-newmail outlook-idle netscape-eoh
tb-extra-mailbox-sep
imap_client_workarounds(pop3): outlook-idle
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
mechanisms: plain login
passdb:
driver: sql
args: /usr/local/etc/dovecot-postfix-sql.conf
userdb:
driver: sql
args: /usr/local/etc/dovecot-postfix-sql.conf
socket:
type: listen
client:
path: /var/spool/postfix/private/auth
mode: 384
user: postfix
group: postfix
Many thanks for your suggestions!
Zbigniew Szalbot
zbigniew szalbot pisze:> Hello, > > I am no programmer at all. I have dovecot set up on two very similar > machines. On one of the boxes, the dovecot server has recently been > showing slower response times. It feels slower. Where it is slower, > dovecot works as an auth server for postfix. I have replaced exim with > postfix on that box and I think since then dovecot started to slow down. > On the other machine the MTA is exim. > > I'd like to ask how to go about debugging the problem. Neither machine > serves many users, the one that is slower has currently only two. It's a > home setup really. >Ah - have just now found this page: http://wiki.dovecot.org/Debugging/ProcessTracing Will try it first. Thanks! Zbigniew Szalbot
Hello, zbigniew szalbot pisze:> Hello, > > I am no programmer at all. I have dovecot set up on two very similar > machines. On one of the boxes, the dovecot server has recently been > showing slower response times. It feels slower. Where it is slower, > dovecot works as an auth server for postfix. I have replaced exim with > postfix on that box and I think since then dovecot started to slow down. > On the other machine the MTA is exim. > > I'd like to ask how to go about debugging the problem. Neither machine > serves many users, the one that is slower has currently only two. It's a > home setup really. > > Here's the output of dovecot -n > > # 1.0.5: /usr/local/etc/dovecot.conf > protocols: imap imaps pop3 pop3s > disable_plaintext_auth: no > login_dir: /var/run/dovecot/login > login_executable(default): /usr/local/libexec/dovecot/imap-login > login_executable(imap): /usr/local/libexec/dovecot/imap-login > login_executable(pop3): /usr/local/libexec/dovecot/pop3-login > login_greeting: Server ready. > verbose_proctitle: yes > first_valid_uid: 125 > first_valid_gid: 125 > mail_extra_groups: mail > mail_location: maildir:/usr/local/virtual/%d/%n > mail_executable(default): /usr/local/libexec/dovecot/imap > mail_executable(imap): /usr/local/libexec/dovecot/imap > mail_executable(pop3): /usr/local/libexec/dovecot/pop3 > mail_plugins(default): quota imap_quota > mail_plugins(imap): quota imap_quota > mail_plugins(pop3): quota > mail_plugin_dir(default): /usr/local/lib/dovecot/imap > mail_plugin_dir(imap): /usr/local/lib/dovecot/imap > mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3 > imap_client_workarounds(default): delay-newmail outlook-idle > netscape-eoh tb-extra-mailbox-sep > imap_client_workarounds(imap): delay-newmail outlook-idle netscape-eoh > tb-extra-mailbox-sep > imap_client_workarounds(pop3): outlook-idle > pop3_uidl_format(default): > pop3_uidl_format(imap): > pop3_uidl_format(pop3): %08Xu%08Xv > pop3_client_workarounds(default): > pop3_client_workarounds(imap): > pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh > auth default: > mechanisms: plain login > passdb: > driver: sql > args: /usr/local/etc/dovecot-postfix-sql.conf > userdb: > driver: sql > args: /usr/local/etc/dovecot-postfix-sql.conf > socket: > type: listen > client: > path: /var/spool/postfix/private/auth > mode: 384 > user: postfix > group: postfix > > Many thanks for your suggestions! > > Zbigniew Szalbot > >I now have the dump as explained on page http://wiki.dovecot.org/Debugging/ProcessTracing After a one minute operation the file is 8,5MB big. I did run kdump -T -f log on it but I have no knowledge to interpret its content. Can anyone help? Thanks! Zbigniew Szalbot
On Tue, 2007-10-23 at 13:50 +0200, zbigniew szalbot wrote:> mail_plugins(imap): quota imap_quota > mail_plugins(pop3): quota..> userdb: > driver: sql > args: /usr/local/etc/dovecot-postfix-sql.confYour strace showed lots of lstat() calls. Does your user_query in dovecot-postfix-sql.conf return "dirsize" as the quota backend? That's a really bad idea with maildir. Use "maildir" backend instead. http://wiki.dovecot.org/Quota -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part URL: <http://dovecot.org/pipermail/dovecot/attachments/20071024/86966024/attachment-0002.bin>
Dear Timo, Timo Sirainen pisze:> On Tue, 2007-10-23 at 13:50 +0200, zbigniew szalbot wrote: > > mail_plugins(imap): quota imap_quota > > mail_plugins(pop3): quota > .. > > userdb: > > driver: sql > > args: /usr/local/etc/dovecot-postfix-sql.conf > > Your strace showed lots of lstat() calls. Does your user_query in > dovecot-postfix-sql.conf return "dirsize" as the quota backend? That's a > really bad idea with maildir. Use "maildir" backend instead. > http://wiki.dovecot.org/Quota >This was it! Thank you very much. Now dovecot is fast as before. Thank you very much indeed! Kind regards, Zbigniew Szalbot