[wplug] SMTP delay

[Ken]

I ran a k6II 550 with about the same memory for over 5 years
successfully. It handled DNS, mail, httpd, and acted as a file server
with acceptable results. Check you BOIS settings for your hard drive PIO
mode. Drive access time might be the issue.

-----Original Message-----
From: wplug-bounces+ken=ramblernet.com at wplug.org
[mailto:wplug-bounces+ken=ramblernet.com at wplug.org] On Behalf Of
duncanhutty at comcast.net
Sent: Monday, August 23, 2004 6:27 PM
To: wplug at wplug.org
Subject: [wplug] SMTP delay



I am testing a mail server and have been told that even an old k6II 500
with 320MB should be able to cope with so many zillion messages a month
with no problem even with LDAP and spamassassin.

When I (handwavingly) test this setup, sending a single, tiny message,
it takes about 15 seconds to 'finish' transmitting the message to the
mail server (on the LAN). I am calculating that time from monitoring
Outlook's send and receive dialogue box.

When I test from the same machine to my ISP's mail server (obviously NOT
on the LAN), the same message takes <1s to transmit.

Trying to eliminate error and check my testing, I made sure that there
was no other traffic/activity on the server. I monitored
/var/log/mail.log and saw 16s between the client connecting and
disconnecting.

Seems to me like 16s is a long time for a 1k message even on a vintage
PC like this. Are my expectations out of whack?

Or should I be expecting better performance and investigating why this
is so slow?

If I move the LDAP server to another machine, would I expect better
perfomance? I would think that network vs. localhost lookups would be
slower, but maybe removing the cpu cost to another cpu might help.

Advice/comments?

Duncan Hutty


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