I'm getting constantly high numbers of page reclaims & involuntary
context switches for dovecot/auth.
page reclaims = minor faults = cpu switching back to system-mode, But
why is the auth process doing that so excessively? Same for the large
number of involuntary context switches...
Attached is my "dovecot -n" output.
Date: Sun, 07 Nov 2010 20:40:34 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 205.93 1.32 2.76 25280 0 0 0 0
0 261 1425
ssl-params 288.71 0.40 0.48 468 0 0 8 0
0 8 1
pop3 0.59 0.80 0.20 651 0 0 48 16
0 12 13
managesieve 0.51 0.00 0.28 576 0 0 416 0
0 13 7
imap 4677.82 0.19 0.89 1480 0 0 488 16
0 23550 136
pop3-login 181.77 0.32 0.28 780 0 0 8 0
0 46 9
Date: Sun, 07 Nov 2010 21:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 303.62 1.10 2.20 26208 0 0 0 0
0 235 1362
ssl-params 301.12 0.00 0.12 467 0 0 8 0
0 7 1
pop3 0.26 0.40 0.36 618 0 0 0 8
0 5 18
managesieve 0.53 0.00 0.28 576 0 0 352 0
0 13 7
imap 2856.91 0.12 0.46 655 0 0 0 0
0 13465 105
pop3-login 228.84 0.76 0.24 779 0 0 0 0
0 90 14
Date: Sun, 07 Nov 2010 22:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 243.12 0.99 4.56 23762 0 0 0 0
0 222 1419
ssl-params 301.25 0.40 0.80 471 0 0 8 0
0 6 4
pop3 0.43 0.40 0.80 623 0 0 0 8
0 6 4
managesieve 0.43 0.00 0.20 577 0 0 536 0
0 14 7
imap 3.63 0.16 0.36 669 1 0 856 0
0 63 93
pop3-login 181.81 0.60 0.40 782 0 0 0 0
0 52 53
Date: Sun, 07 Nov 2010 23:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 232.83 1.72 2.26 25613 0 0 0 0
0 254 1175
ssl-params 149.63 0.00 0.16 469 0 0 40 0
0 10 1
pop3 25.68 0.28 0.12 741 0 0 9696 16
0 109 14
managesieve 0.25 0.40 0.28 576 0 0 8 0
0 11 2
imap 0.32 0.00 0.16 625 0 0 0 0
0 11 11
pop3-login 69.88 0.48 0.24 779 0 0 0 0
0 27 6
Date: Mon, 08 Nov 2010 00:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
managesieve 0.29 0.00 0.36 576 0 0 8 0
0 7 16
imap 0.58 0.80 0.36 637 0 0 0 0
0 10 9
Date: Mon, 08 Nov 2010 01:00:01 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 421.98 1.32 1.66 24216 0 0 0 0
0 267 723
ssl-params 538.47 0.00 0.16 470 0 0 8 0
0 7 1
pop3 0.19 0.80 0.96 671 1 0 760 8
0 22 221
managesieve 0.63 0.40 0.13 578 0 0 192 0
0 9 11
managesieve-lo 18616.9 86.77 32.49 319768 1 0 168 0
0 63448 48838
imap 42.28 0.00 0.52 676 0 0 0 0
0 182 63
pop3-login 361.68 0.76 0.40 780 0 0 0 0
0 52 2
Date: Mon, 08 Nov 2010 02:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 592.76 0.97 1.40 23640 8 0 8272 0
0 307 321
ssl-params 676.93 0.00 0.24 468 0 0 136 0
0 18 10
pop3 6.10 0.24 0.44 672 1 0 1688 8
0 35 40
managesieve 0.71 0.12 0.14 572 5 0 1632 0
0 17 38
managesieve-lo 1023.50 1.45 0.46 6066 1 0 184 0
0 1104 317
imap 0.87 0.80 0.44 674 1 0 640 0
0 18 25
pop3-login 361.79 0.72 0.32 780 0 0 112 0
0 56 11
Date: Mon, 08 Nov 2010 03:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 600.71 0.96 1.18 22902 0 0 56 0
0 235 212
ssl-params 242.66 0.00 0.16 471 0 0 136 0
0 15 6
pop3 0.20 0.16 0.28 675 1 0 1312 8
0 32 15
managesieve 0.46 0.00 0.36 580 1 0 480 0
0 11 12
managesieve-lo 286.21 0.60 0.44 1048 1 0 184 0
0 50 88
imap 0.34 0.80 0.28 675 0 0 0 0
0 9 20
pop3-login 361.43 0.84 0.32 780 0 0 112 0
0 55 13
Date: Mon, 08 Nov 2010 04:00:01 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 587.34 0.90 1.52 22075 14 0 14288 0
0 443 375
ssl-params 275.27 0.00 0.12 469 0 0 136 0
0 14 15
pop3 23.90 0.37 0.80 2906 5 0 36856 24
0 3885 136
managesieve 0.45 0.12 0.16 577 1 0 472 0
0 10 20
managesieve-lo 357.38 0.14 0.52 1271 1 0 184 0
0 100 28
imap 0.42 0.00 0.40 671 0 0 0 0
0 9 56
pop3-login 363.16 0.12 0.64 782 0 0 112 0
0 263 23
Date: Mon, 08 Nov 2010 05:00:01 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 1005.53 0.91 1.60 21583 0 0 0 0
0 238 92
ssl-params 172.31 0.40 0.80 469 0 0 0 0
0 6 3
pop3 0.11 0.16 0.28 667 0 0 0 8
0 11 18
managesieve 0.42 0.80 0.20 577 0 0 520 0
0 13 4
managesieve-lo 84.84 0.80 0.52 1049 0 0 0 0
0 45 11
imap 0.51 0.12 0.76 664 0 0 0 0
0 10 11
pop3-login 361.78 0.64 0.28 773 0 0 0 0
0 13 2
Date: Mon, 08 Nov 2010 06:00:01 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 467.35 0.16 0.17 797 0 0 0 0
0 8 9
ssl-params 273.33 0.00 0.16 470 0 0 0 0
0 5 3
pop3 0.14 0.12 0.36 667 0 0 0 8
0 14 1
managesieve 0.20 0.00 0.28 576 0 0 0 0
0 10 1
managesieve-lo 640.83 0.13 0.44 1272 0 0 0 0
0 87 17
imap 0.33 0.40 0.32 665 0 0 0 0
0 10 47
pop3-login 362.87 0.60 0.24 774 0 0 0 0
0 13 3
Date: Mon, 08 Nov 2010 07:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 468.95 0.96 1.34 21628 0 0 0 0
0 243 218
ssl-params 83.87 0.00 0.12 469 0 0 0 0
0 7 1
pop3 0.11 0.16 0.24 667 0 0 0 8
0 11 6
managesieve 0.83 0.00 0.88 577 0 0 536 0
0 9 12
managesieve-lo 231.47 0.18 0.96 1381 0 0 0 0
0 106 17
imap 0.71 0.12 0.80 665 0 0 0 0
0 10 47
pop3-login 292.13 0.56 0.28 779 0 0 0 0
0 46 7
Date: Mon, 08 Nov 2010 08:00:02 +0100
type real user sys reclaim faults swaps bin bout
signals volcs involcs
auth 452.63 0.83 1.44 20188 0 0 16 0
0 286 121
ssl-params 289.68 0.00 0.80 470 0 0 136 0
0 14 6
pop3 1.37 0.80 0.17 681 1 0 1936 16
0 55 28
managesieve 0.24 0.40 0.20 580 0 0 256 0
0 14 5
managesieve-lo 1952.41 4.93 1.58 18647 0 0 8 0
0 3673 1339
imap 0.17 0.40 0.19 665 0 0 0 0
0 6 48
pop3-login 96.75 0.60 0.28 777 0 0 112 0
0 41 14
--
Ralf Hildebrandt
Geschäftsbereich IT | Abteilung Netzwerk
Charité - Universitätsmedizin Berlin
Campus Benjamin Franklin
Hindenburgdamm 30 | D-12203 Berlin
Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
ralf.hildebra...@charite.de | http://www.charite.de
# 1.2.15: /usr/local/etc/dovecot.conf
# OS: Linux 2.6.32-23-generic-pae i686 Debian squeeze/sid
protocols: imap imaps pop3s managesieve
listen(default): *
listen(imap): *
listen(pop3): *
listen(managesieve): *:4190
ssl_ca_file: /etc/ssl/certs/ca-certificates.crt
ssl_cert_file: /etc/ssl/certs/cert-188235905-postamt.charite.de-g02.pem
ssl_key_file: /etc/ssl/private/postamt.key
disable_plaintext_auth: no
version_ignore: yes
login_dir: /usr/local/var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login -D
login_executable(imap): /usr/local/libexec/dovecot/imap-login -D
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login -D
login_executable(managesieve): /usr/local/libexec/dovecot/managesieve-login
login_process_per_connection: no
login_processes_count: 4
login_max_processes_count: 64
max_mail_processes: 2048
mail_max_userip_connections: 1024
verbose_proctitle: yes
mail_location: maildir:~/Maildir
fsync_disable(default): yes
fsync_disable(imap): yes
fsync_disable(pop3): yes
fsync_disable(managesieve): no
maildir_copy_preserve_filename: yes
maildir_very_dirty_syncs: yes
mail_drop_priv_before_exec: yes
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_executable(managesieve): /usr/local/libexec/dovecot/managesieve
mail_plugins(default): quota imap_quota trash mail_log fts fts_squat zlib
autocreate
mail_plugins(imap): quota imap_quota trash mail_log fts fts_squat zlib
autocreate
mail_plugins(pop3): quota mail_log
mail_plugins(managesieve):
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
mail_plugin_dir(managesieve): /usr/local/lib/dovecot/managesieve
mail_log_max_lines_per_sec: 0
imap_client_workarounds(default): outlook-idle netscape-eoh
imap_client_workarounds(imap): outlook-idle netscape-eoh
imap_client_workarounds(pop3):
imap_client_workarounds(managesieve):
pop3_lock_session(default): no
pop3_lock_session(imap): no
pop3_lock_session(pop3): yes
pop3_lock_session(managesieve): no
pop3_uidl_format(default): %08Xu%08Xv
pop3_uidl_format(imap): %08Xu%08Xv
pop3_uidl_format(pop3): %v-%u
pop3_uidl_format(managesieve): %08Xu%08Xv
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
pop3_client_workarounds(managesieve):
namespace:
type: private
separator: .
prefix: INBOX.
inbox: yes
list: yes
subscriptions: yes
lda:
fsync_disable: yes
postmaster_address: postmas...@charite.de
mail_plugins: sieve quota trash mail_log fts fts_squat
quota_full_tempfail: yes
syslog_facility: local4
auth default:
mechanisms: plain login
cache_size: 2048
master_user_separator: *
debug: yes
debug_passwords: yes
passdb:
driver: passwd-file
args: /usr/local/etc/dovecot.masterusers
pass: yes
master: yes
passdb:
driver: shadow
passdb:
driver: pam
args: cache_key=%u dovecot
userdb:
driver: passwd
socket:
type: listen
client:
path: /var/spool/postfix/private/auth
mode: 432
user: postfix
group: postfix
plugin:
fts: squat
quota: maildir
quota_rule: Trash:storage=2048M
quota_warning: storage=99%% /usr/local/scripts/quota-warning 99
quota_warning2: storage=95%% /usr/local/scripts/quota-warning 95
quota_warning3: storage=90%% /usr/local/scripts/quota-warning 90
quota_warning4: storage=85%% /usr/local/scripts/quota-warning 85
trash: /usr/local/etc/dovecot-trash.conf
autocreate: Trash
autocreate2: spam
autocreate3: Sent
autocreate4: Drafts
autosubscribe: Trash
autosubscribe2: spam
autosubscribe3: Sent
autosubscribe4: Drafts
sieve: ~/.dovecot.sieve
sieve_dir: ~/sieve
