Re: [AMaViS-user] How to justify amavisd-new delay

> >From what I understand from these posts:
> http://marc.info/?l=postfix-users&m=117199107216689
> http://marc.info/?l=postfix-users&m=118582818426445
> your active queue is overloaded. If this is the case, this
> often is a result of messages coming in faster than they are
> going out (quite often due to the amount of time it takes to
> scan messages). I think you have been fighting this same
> problem for years now, as a number of others have too.
>
> Essentially, from:
> http://www.postfix.org/QSHAPE_README.html#active_queue
> "Congestion occurs in the active queue when one or more
> destinations drain slower than the corresponding message input rate."
>
> I would start by looking at some TIMING data ($log_level =
> 2;) to see how much time amavis spends on various functions
> (very likely spamassassin is where the most time is spent).
> If it is spamassassin, I would next break down exactly what
> SA is spending the most time on.
>
> http://marc.info/?l=amavis-user&m=120284838504641
> http://marc.info/?l=amavis-user&m=118799923325417
> http://marc.info/?l=amavis-user&m=120283445607760
>
> This happens frequently. You can walk through a number of
> posts from the postfix-users archives from this link:
> http://marc.info/?l=postfix-users&w=...tive+queue&q=t
>
> Also interesting reading (even if are not running Postfix 2.5):
> http://www.postfix.org/STRESS_README.html
>
> --
> Gary V

Thanks Gary,

you're explanation is very brief and fully explanatory.

I surely will execute some measurement of SA efficiency by increasing
log verbosity.

In the mean time I find very embarassing some situations where I have a
congtestioned SMTP gateway server and I can't avoid new incoming SMTP
session from being managed by that server (In this manner I only
increase congestion. While I like to let that server to 'digest' the
queued mail traffic before accepting new SMTP connection, and redirect
the new SMTP connection on other SMTP gateway server of my mail system).

I use DNS balancing and when a queue on a server is congestioned I get
no effect from taking away that server from being pointed by an MX
record, because DNS changes propagations take long time. :-)

Is there any trick to tackle this issue?

rocsca


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