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Subject: Re: Relaying Performance
From: Wietse Venema (wietseporcupine.org)
Date: Sun Feb 06 2000 - 15:21:41 CST

Greg Stark:
> > > Our initial experiments seemed to indicate that it couldn't deliver faster
> > > than about 5/s. Is this just a simple tuning issue or are the numbers I'm
> > > talking about simply infeasible with postfix?
> >
> > Postfix has a weak spot here where a lot of inbound mail can swamp
> > all the I/O resources so that delivery rates drop. You can quite
> > likely get more mail through Postfix by reducing the number of SMTP
> > server processes.
>
> But my feeder only opens a single connection and sends all the mail over that.
> (Actually that's not strictly true, it reopens the connection after any error
> and after 1000 successful deliveries.)

Thanks for prividing a little more detail on your measurement.

For a more precise reply from my end you will also have to specify
how recipients are distributed over messages (one mail with many
recipients or one-to-one mail) and how mail is distributed over
destinations (all mail having the same destination on the same LAN,
or all mail going to widely different remote locations).

Its little details like these that make a huge difference.

        Wietse