dovecot - Mar 2011 - Increase /proc/sys/fs/inotify/max_user_instances

Hi

I allready have set 256 on max_user_instances , and in the log i keep 
seeing
Mar 28 10:08:44 mail dovecot: imap(some.username): Warning: Inotify 
instance limit for user 98 (UID vmail) exceeded, disabling. Increase 
/proc/sys/fs/inotify/max_user_instances

All users use thunderbird 3.1.9 , and from time to time this show in log 
, with a random user.

What can i do to resolve this issue ?

my doveconf-n :

# 2.0.11: /usr/dovecot2/etc/dovecot/dovecot.conf
# OS: Linux 2.6.35.4 i686
auth_cache_negative_ttl = 10 secs
auth_cache_size = 10 M
auth_cache_ttl = 1 mins
auth_mechanisms = plain login cram-md5
auth_socket_path = /var/run/dovecot/auth-userdb
auth_verbose_passwords = plain
base_dir = /var/run/dovecot/
default_client_limit = 5000
default_internal_user = vmail
default_login_user = nobody
default_process_limit = 200
deliver_log_format = mail from=%f subject=%s msgid=%m: %$
dict {
   acl = mysql:/usr/dovecot2/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
first_valid_uid = 1
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
listen = *
mail_location = maildir:~/Maildir
mail_plugins = " quota acl trash notify mail_log"
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date
namespace {
   inbox = yes
   location    prefix    separator = /
   subscriptions = yes
   type = private
}
namespace {
   hidden = no
   list = children
   location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
   prefix = shared/%%u/
   separator = /
   subscriptions = no
   type = shared
}
passdb {
   args = /usr/dovecot2/etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   acl = vfile
   acl_shared_dict = proxy::acl
   autocreate = Trash
   autocreate2 = Drafts
   autocreate3 = Sent
   autosubscribe = Trash
   autosubscribe2 = Drafts
   autosubscribe3 = INBOX
   autosubscribe4 = Sent
   mail_log_events = delete mailbox_delete mailbox_rename
   mail_log_group_events = yes
   quota = maildir:User quota
   quota_warning = storage=95%% quota-warning 95 %u
   quota_warning2 = storage=95%% quota-warning 90 %u
   quota_warning3 = storage=85%% quota-warning 85 %u
   sieve = ~/.dovecot.sieve
   sieve_dir = ~/sieve
   trash = /usr/dovecot2/etc/dovecot/dovecot-trash.conf.ext
}
postmaster_address = postmaster at mydomain.com
protocols = imap
rejection_subject = Rejected: %s: %r
service auth {
   unix_listener auth-userdb {
     mode = 0660
     user = vmail
   }
}
service dict {
   unix_listener dict {
     user = vmail
   }
}
service imap-login {
   process_min_avail = 16
   service_count = 1
}
service imap {
   process_limit = 2048
   vsz_limit = 512 M
}
service quota-warning {
   executable = script /bin/quota_warning.sh
   unix_listener quota-warning {
     user = vmail
   }
   user = vmail
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
   args = /usr/dovecot2/etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
protocol lda {
   mail_plugins = " quota acl trash notify mail_log sieve autocreate"
}
protocol imap {
   imap_client_workarounds = delay-newmail tb-extra-mailbox-sep
   mail_max_userip_connections = 16
   mail_plugins = " quota acl trash notify mail_log imap_quota
imap_acl"
}

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On Thu, 2011-03-31 at 09:41 +0300, Adrian Stoica wrote:
> Hi
> 
> I allready have set 256 on max_user_instances , and in the log i keep 
> seeing
> Mar 28 10:08:44 mail dovecot: imap(some.username): Warning: Inotify 
> instance limit for user 98 (UID vmail) exceeded, disabling. Increase 
> /proc/sys/fs/inotify/max_user_instances
Note that kernel only sees vmail as the user for everyone.
> What can i do to resolve this issue ?
Increase it more!
> service imap {
>    process_limit = 2048
You can have a maximum of 2048 IMAP connections and every one of them
could be IDLEing and using one inotify instance. So set it to 2048.