Date: Mon, 5 Feb 2001 14:13:55 -0800 (PST) From: Dan Phoenix <dphoenix@bravenet.com> To: freebsd-questions@freebsd.org Subject: Re: qmail IO problems (fwd) Message-ID: <Pine.BSO.4.21.0102051413300.18264-100000@gandalf.bravenet.com>
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---------- Forwarded message ----------
Date: Mon, 5 Feb 2001 14:12:00 -0800 (PST)
From: Dan Phoenix <dphoenix@bravenet.com>
To: Alfred Perlstein <bright@wintelcom.net>
Cc: scanner@jurai.net, freebsd-hackers@FreeBSD.ORG,
freebsd-question@FreeBSD.ORG
Subject: Re: qmail IO problems
Actually another point i should bring up is there are 4 separate perl
scripts that basically grab users from a mysql database....
their mail message is taken and piped to...sendmail -t
which is a symbolic link to /var/qmail/bin/sendmail -t
...someone told me about a concept of "herding the queue" doing it that
fashion....I am quite interested if there is a more effective way of doing
mail with qmail and perl...maybe the way ezmlm does it so quickly.
But the I/O problem is still there without perl scripts running from all
30 internal fbsd webservers.
On Mon, 5 Feb 2001, Alfred Perlstein wrote:
> Date: Mon, 5 Feb 2001 13:55:01 -0800
> From: Alfred Perlstein <bright@wintelcom.net>
> To: Dan Phoenix <dphoenix@bravenet.com>
> Cc: scanner@jurai.net, freebsd-hackers@FreeBSD.ORG,
> freebsd-question@FreeBSD.ORG
> Subject: Re: qmail IO problems
>
> * Dan Phoenix <dphoenix@bravenet.com> [010205 13:50] wrote:
> > /0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
> > Load Average ||||
> >
> > /0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100
> > cpu user|X
> > nice|
> > system|XXXXXX
> > interrupt|
> > idle|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> >
> > /0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100
> > ad0 MB/s
> > tps|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX108.83
> >
> >
> > that is why i know it is IO....#1.
> > #2..not configuration errors that I know of.
> > tailing the tcpserver current log shows lots of traffic comming in and
> > out.....yet it keep getting queued up......so my guess is the IO.
> > Post fix is not the solution...would be the exact same problem...a mail
> > deamon was to read each message to send them right? Same disk I/O problem
> > will occur. Btw who are you and when you say brad....who are you talking
> > about?
>
> Here's a couple of tunables you might want to try, use then one at a
> time and see if it improves things:
>
> vfs.vmiodirenable = 1
> vfs.write_behind = 0 or 2 (default is 1)
>
> You might also want to consider a more robust disk subsystem, using
> a single IDE non-redundant disk for storing mail isn't such a hot
> idea.
>
> --
> -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
> "I have the heart of a child; I keep it in a jar on my desk."
>
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