[Mailman-Users] Big Lists

alex wetmore alex at phred.org
Tue Dec 18 06:05:19 CET 2001

On Mon, 17 Dec 2001, Dan Wilder wrote:
> The DSL does get to be pretty much of a nuisance to run vi on
> over an ssh connection, when the list mail is going out.

I used to have issues with this, but my solution was to turn on
dummynet (http://cs.baylor.edu/~donahoo/tools/dummy/) on my firewall
and limit SMTP to use half of my outbound bandwidth (I get 256kbps,
SMTP gets 128kbps of that).

Interactive sessions are a lot more pleasant to work with now.

I know a lot more about Windows SMTP server than Postfix, but outbound
delivery rate on machines is generally limited by the number of io's
per second that a disk can do.  If you want to saturate a fast link
with small messages you'll probably need to stripe your queue/spool
directory across multiple disks.  Performance on the Windows SMTP
stack will also greatly improve if you increase the rcpt to batching
that Mailman uses.  On many Unix MTAs that will slow you down, because
the MTA can't send the same message to multiple destinations at the
same time.

My Mailman configuration uses Unix for running Mailman, and Windows
2000 SMTP Server for outbound email.  I doubt many (if any) other
people are using this configuration, but if people are interested in
more detail on configuring Windows 2000 SMTP for maximum performance I
can help out quite a bit.


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