Brandon Hilkert:
> >> what is best to look out and compare?
> >
> > When the disk is 100% busy, then it is the bottle neck. Disks can
> > be 100% busy jumping around doing very little I/O.
> >
> > As Noel suggested in earlier email, try running smtp-sink which
> > does no disk I/O at all. If things are still slow, then the problem
> > is network or MS-Exchange configuration.
>
> I found the source. How do I build it in Debian? I realize this is probably
> a stupid question, but I don't have tons of experience with Linux.
cd $postfixsource
make
> Exchange hasn't been involved at all. I've been running everything from
> scripts, hoping to zero in on the bottleneck.
You MUST run deliveries in parallel. SMTP is a stupid protocol;
one connection cannot saturate a server.
In fact, Postfix actually has safeguards for naive benchmark
measurements that send mail into Postfix over only a few connections.
Wietse
