From: Warren Flemmer (no email)
Date: Fri Mar 01 2002 - 03:40:50 EST
Greetings
I have been having complaints about the slow responses from a postfix
server, but only from dial-up users. I have had this issue from the word
go, but after a couple of months of trying this and that, reading
whatever I can find on this, still the issue keeps showing up. I have
read the FAQs, which implies that their is a lookup problem. I have
tested both forward and reverse lookups for the ip used by the dial-up
users and they are good (except one that I left out so I could compare).
I have also setup the hosts file for the ip's used by the dial-up
servers (users ips), but yet the response of postfix for the dialup
users is bad. I have left the default search order for host file and DNS
(host first then DNS). Lan users do not have an issue, the response is
great. The server also has cyrus-imap which responds like a dream to all
users (so I don't think its a resource issue). The problem does not seem
to be the transfer of the actual data but rather the response to
commands that seems to have large delays (3 to 20 seconds, and on some
occasions going close to a minute or more). Cyrus on the other hand
seems almost instantaneous, even for dial-up users.
I run smtpd from xinetd and it is a RH7.1 box. postfix-20010228-pl03. I
have increased 'nice' to -10 in xinetd which did help a little. I do not
want to remove smtp from xinetd as it offers some other features that I
find very useful. I am also making use of mysql tables for most things.
I am also using amavis perl for anti-virus. Server load is very low,
about 300 users. Most of the time the CPU is at 99 percent ideal.
Any ideas of where to go from here would be appreciated.
Regards
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