On Tue, Oct 28, 2008 at 07:50:51PM +0100, Francis SOUYRI wrote:
> >> Time to time we have lot of mail in the incoming queue, "no" mail in the
> >> active queue, the "qmgr "is very" slow and the server is very idle. We
> >> tested the antispam/virus to see if there is a problem but the response
> >> is very good.
> >
> >How often does the qmgr(8) process id change?
>
> No change, only when I restart postfix.
And how often do you do that?
> >> T 5 10 20 40 80 160 320 640 1280 1280+
> >> TOTAL 3201 2121 937 87 11 21 23 0 0 0 1
> >
> >Almost all the mail in "incoming" is recent, with ~2000 msgs under 5
> >minutes old, and ~1000 between 5 and 10 minutes old. What happened
> >leading up to this?
>
> I do not know.
You have to find out, by reading your logs, looking at message rates,
failed deliveries that took a long time to complete, ...
Is trivial-rewrite performing well? Are you using SQL or LDAP transport
tables? qmgr itself is only slow when disk I/O is saturated or trivial-
rewrite is slow.
> >> qshape active
> >>
> >> T 5 10 20 40 80 160 320 640 1280 1280+
> >> TOTAL 32 0 0 32 0 0 0 0 0 0 0
> >
> >Exactly 32 active messages, all 10-20 minutes old, what happened leading
> >up to this?
> >
> >What's in the deferred queue? Read your logs, looking for errors, warnings,
> >throttled transports and nexthops, ...
> >
>
> qshape deferred
>
> T 5 10 20 40 80 160 320 640 1280
> 1280+
> TOTAL 480 2 0 1 1 13 61 187 36 9
> 170
> hotmail.com 152 1 0 1 0 2 38 103 7 0
> 0
> hotmail.fr 107 1 0 0 0 8 15 67 16 0
> 0
> cji2.net 61 0 0 0 1 3 5 6 1 0
> 45
Not much.
> transport (same subnet).
>
>
> >Is your disk I/O adequate? ... The information you provide is too skimpy.
>
> I have 2x36 u320 15000rpm and 2x73Go u320 15000rpm and 4go memory.
Disk I/O is not disk storage capacity. Is the disk saturated with I/O requests?
> The information is too skimpy for this we need your help, we are trying for
> several weeks, lot of configs changes in_flow_delay, default_dest...,
> smtpd_error_sleep_time = 0s, increase/decrease postfix/puremessage process,
> install local dns... without any success some time this is very bad we are in
> the fog...
>
You have to make better measurements if you want help. The queue manager
moves mail from incoming to active very rapidly unless the disk is
saturated or trivial-rewrite is gummed up, ...
Do review your logs in detail, look at disk I/O, /CPU, memory utilization,
post your "postconf -n". Run a syscall tracer on the queue manager and
see where it blocks, ...
--
Viktor.
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