Re: Slow Response for dial-up users

From: Ralf Hildebrandt (no email)
Date: Fri Mar 01 2002 - 08:02:40 EST


On Fri, Mar 01, 2002 at 02:42:02PM +0200, Warren Flemmer wrote:

> >Does cyrus perform reverse lookups?

> The logs imply that it does, both the ip and the FQDN are pressent in
> the logs.

Ah. Hmm.

> Its on the same server, with high ideal %. Is there more I need to check
> here.

Maybe check the Postfix logs for "connection refused" or
"(error|warning|fatal)" and the mysqld logs for oddities.

Nothing in the config.
 
> smtpd
>
> 2033 connections
> 271 hosts/domains
> 84 avg. connect time (seconds)
> 47:23:55 total connect time

84s average connect time? Whoa!

At out box:

smtpd

   28211 connections
    1332 hosts/domains
       2 avg. connect time (seconds)
 13:48:32 total connect time

We do more than 20 times the volume of your mail with 1/40 of connect
time...

Is your DNS slow?
Do you have a caching DNS?
Do you have multiple DNS servers in /etc/resolv.conf?
How do the query times look like if you try:

% dig @dns1 MX charite.de
% dig @dns1 MX charite.de

% dig @dns2 MX charite.de
% dig @dns2 MX charite.de

> fail...
> 1 64.232.234.253: address not listed for hostname mx4a.y8k.net
> 1 66.8.23.122: address not listed for hostname na.sdn.net.za
> 1 64.232.234.85: address not listed for hostname mx2a.oc9.net
> 1 66.115.47.118: hostname opt.edirectnetwork.net verification
> fai...

Lots of reverse DNS lookups fail.
 
> Fatal Errors: none
>
> Panics: none
>
> Master daemon messages: none

Good!

> Senders by message count
> ------------------------
> 80 from=<>
> ......
>
>

> This last bit I don't like. Someone is not putting in their reply to
> address. Would it be sensible to stop this?

No. these are bounces.

-- 
Ralf Hildebrandt (Im Auftrag des Referat V A)   
Charite Campus Virchow-Klinikum                 Tel.  +49 (0)30-450 570-155
Referat V A - Kommunikationsnetze -             Fax.  +49 (0)30-450 570-916
Why you can't find your system administrators:
out chasing the rodents off of the twisted pair/power lines 
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