Hello. At my work we are trying to use exim4 as a mail gateway for our news mailing lists with currently about 1000000 subscribers, thus we need to send 10^6 mails daily or better twice faster since we want all mails to proceed before they became too old. Currently we are using exim 4.69-9 on Debian. After reading mailing archives we've enabled the following options in exim configuration file:
split_spool_directory queue_run_max = 100 remote_max_parallel = 200 queue_only_load = 8 deliver_queue_load_max = 12 smtp_connect_backlog = 50 smtp_accept_max = 500 smtp_accept_queue_per_connection = 1000 We are running exim process with -odqs -q1m options. We've put hints database (/var/spool/exim4/db) on tmpfs. And in result on Intel Corporation E7520 with 2 Intel(R) Xeon(TM) CPU 3.00GHz, with 4G RAM and IDE software raid1 exim is not enough fast (we've managed to send 15 000 letters per 30 minutes) So the question is are there any hints how to improve exim performance? Currently it looks like our performance bottleneck is our discs - currently we use software raid to improve performance, but still we have only about 50-70Mb speed (as hdparm states). But if we put, say scsi disks does this makes us much faster? Or should we use some different mail server software (suggestions, please?)? I found that to improve performance it was suggested to send to most popular domains first but it's not very easy (not to say problematical) in our setup. Another problem is related to -odqs option. As I understand the manual this option tels exim to do only routing and *no* delivery. Then why I see the following messages in the log file: 2009-04-28 11:34:09 1LyhpP-0004TO-HX no immediate delivery: load average 9.40 ? Probably this is our performance bottleneck too? In any case thank you for any hints, -- Peter. -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
