On Fri, 14 Oct 2011, Henrique de Moraes Holschuh wrote: > On Thu, 13 Oct 2011, John Madden wrote: >>> Our Postfix relays (there are 3) seem to make one lmtp connection per >>> message, rather than sending multiple messages down a single connection. >>> >>> Do any Cyrus+Postfix users out there have tuning recommendations? I see a >>> lot of postfix lmtp_* config options, but I know little about Postfix. >> >> I make no guarantees about these, but try this out: >> >> lmtp_destination_concurrency_limit = 50 >> lmtp_destination_recipient_limit = 5000 >> lmtp_connection_cache_on_demand = no >> lmtp_data_done_timeout = 3600s >> >> It's been a couple years, but I definitely had oddball issues with LMTP >> under load and somewhere along the line these options fixed them. YMMV. >> The usual RTFineM about these applies too: >> http://www.postfix.org/postconf.5.html > > You should name an specific LMTP transport for cyrus deliveries in postfix' > master.cf. That way, you can use <transport_name>_<parameter_name> to > configure it, without affecting other potential users of the same transport > binary. > > E.g. if you created a cyruslmtp transport (which uses the lmtp binary), you > could have: > > cyruslmtp_destination_concurrency_limit = 50 > cyruslmtp_destination_recipient_limit = 5000 > cyruslmtp_connection_cache_on_demand = no > cyruslmtp_data_done_timeout = 3600s > > Obviously you must not do something that would make it impossible to batch > the deliveries into a single ESMTP/LMTP transaction. If you use a mailing > list, that means you must not enable VERP. > > You also want to let cyrus hardlink multi-recipient deliveries when possible > (but watch out for your backups if they duplicate hardlink files, backup > space will be much larger than spool space): > > in imapd.conf, add: > > singleinstancestore: 1 Thanks for the tips John and Henrique. Our Postfix admin is going to take a look. Do you have any guidelines for setting the number of lmtp children allowed on the Cyrus side? We have 3 frontends set to maxchild=25 each. Is it better to keep maxchild low, or would throughput improve with a higher limit? Thanks, Andy ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
