Hello,
I am running a test setup in a docker stack with Dovecot (2.3.21). Basically as
a test to see whats possible.
The whole thing works okay, but I noticed that with imaptest (latest version)
somewhere between 230 and 270 requests per second on a login+logout cycle it
cannot go further. However, this is a 384G memory, 48 core, dual-cpu setup that
is pretty much idling (utilization somewhere around 6-12%). The ssds are not
loaded at all. The memory usage is low.
For testing purpose I set nopassword=y and allowed all logins, the users just
require a small mysql db lookup which is done once before the cache is filled.
If I copy that exact same stack to my local machine, I yield around 450 cycles
per second. And the only difference I somehow see is that my local machine has
a faster cpu-memory connection and only one cpu with less cores.
Is it possible memory speed is a limiting factor because of the
cpu-memory-mapping on the server and the slower memory?
What performance should I expect?
Asking because I am planning to run a stateless client at a later point and the
limited login-performance really seems to make that difficult at scale.
doveconf -n:
# 2.3.21 (47349e2482): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.21 (f6cd4b8e)
# OS: Linux 6.8.0-36-generic x86_64 Debian 11.7 ext4
# Hostname: 4e83f0e9d630
auth_cache_negative_ttl = 0
auth_cache_size = 50 M
auth_cache_ttl = 5 hours
auth_cache_verify_password_with_worker = yes
auth_debug = yes
auth_debug_passwords = yes
auth_failure_delay = 0
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = yes
auth_worker_max_count = 500
default_vsz_limit = 2 G
disable_plaintext_auth = no
doveadm_api_key = # hidden, use -P to show it
doveadm_password = # hidden, use -P to show it
doveadm_port = 2425
log_debug = event=*
log_path = /var/log/dovecot-debug.log
login_trusted_networks = 10.0.0.0/8 127.0.0.0/8
mail_debug = yes
mail_fsync = never
mail_gid = 1000
mail_location = maildir:/data/vmail/%d/%1n/%n
mail_uid = 1000
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 index ihave duplicate
mime foreverypart extracttext
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
}
passdb {
args = nopassword=y
driver = static
}
protocols = " imap lmtp sieve pop3 submission"
service anvil {
chroot = empty
client_limit = 75100
idle_kill = 4294967295 secs
process_limit = 1
unix_listener anvil-auth-penalty {
mode = 00
}
}
service auth-worker {
client_limit = 1
process_limit = 6000
user = $default_internal_user
}
service auth {
client_limit = 91000
}
service doveadm {
inet_listener {
port = 2425
}
inet_listener http {
port = 8080
}
}
service imap-login {
process_limit = 15000
process_min_avail = 48
service_count = 0
vsz_limit = 2 G
}
service imap {
client_limit = 1
process_limit = 15000
}
userdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
protocol doveadm {
passdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
name =
override_fields = port=2425 ssl=no starttls=no
}
}
protocol imap {
mail_max_userip_connections = 250
}
Best regards
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