At 9:22 PM -0800 11/24/00, J C Lawrence wrote:
>ObNote: As confirmed by Wietse Venema, of the factors within a
>SysAdm's control, MTA's are disk IO bound.
assuming you have them attached to a decent pipe, yes. If you're on a
slow network, you're on a slow network. But assuming you aren't
trying to stuff five pounds of mail out a two pound network, that's
true. The biggest issues are DNS resolving and the client side speed,
neither of which are under your control, and a big factor in the
latter is SMTP overhead. I recently had a real-world test of this
where I sent out about a 10K e-mail to a few (mumble number)
subscribers, then later on sent a 20K e-mail to the same (mumble
number) subscriber.s The rate of delivery was about the same in terms
of 100K/deliveries per hour, but the network usage ramped up to take
into consideration the size of the message.
That seems a real clear sign to me that SMTP overhead and DNS
overhead are the slowdowns -- when the message size doubled, delivery
rate stayed pretty much the same, but the network sped up to ship
them through...
> > I'd suggest switching to qmail, which pumps out mailing list mail
>> a lot faster than sendmail does.
>
>Given QMail's odd licensing status I'd recommend Postfix or Exim in
>preference to QMail.
that's a religious war. be my guest... (grin).
--
Chuq Von Rospach - Plaidworks Consulting (mailto:[EMAIL PROTECTED])
Apple Mail List Gnome (mailto:[EMAIL PROTECTED])
The vet said it was behavioral, but I prefer to think of it as genetic.
It cuts down on the liability -- Get Fuzzy
