natan maciej milaszewski:
> Hi
> Sorry for to trivial e-mail and stupid question.I have a dedicated
> bare-metal server. I need some tunig postfix to faster delivery (every
> time i look in qshappe -it's good)
> Amvis and dovecot is in the external server to.
>
>
> virtual_transport = lmtp:inet:10.0.100.5:24
>
> now i change:
> lmtp_destination_concurrency_limit = 100 (default it was 20)
> default_destination_concurrency_limit = 100 (default it was 20)
> lmtp_destination_recipient_limit = 1
>
> default_process_limit = 1200 (this machine is fast)
>
> and master.cf
> smtp-amavis???? unix??? -?????? -?????? -?????? -?????? 60?????? smtp
>
> Is there any real soft for testing configuration performance?
> I care about a smal queue and fast delivery to lmt (local dovcot-claster
> with many dovecot nodes)
You need to measure your latencies. Fortunately, Postfix logs that
information in great detail:
The format of the "delays=a/b/c/d" logging is as follows:
* a = time from message arrival to last active queue entry
* b = time from last active queue entry to connection setup
* c = time in connection setup, including DNS, EHLO and STARTTLS
* d = time in message transmission
Based on this you can make a more intelligent choice than maxing
out process limits and concurrencies.
To test performance, Posfix source code comes with smtp-source and
smtp-sink utilities.
To build:
Download and unpack tarball from http://www.postfix.org/download.html
$ make makefiles shared=no (don't bother with SASL, TLS and so on)
$ make
To send 10 messages over 1 SMTP session:
$ cd src/smtpstone
$ ./smtp-source -c -m 10 -s 1 \
-f sen...@example.com -t recipi...@example.com \
inet:host:port
Review the manpage in html/smtp-source.1.html for more options.
Wietse
