On Thu, 29 Nov 2001, Wietse Venema wrote:

>
> With one recipient per message, disk I/O is the biggest problem,
> and qmail does a bit more than Postfix. I suspect that's where most
> of the speed difference comes from in his specific case.
>
> With small email messages, PIPELINING saves about 30% of the packet
> count. The gain depends on number of recipients versus message size.
> It's modest with one-recipient mail.

 Wouldn't that depend on link latency for total transaction time ?
Compare for example a LAN link with ~1 msec RTT with a satellite link with
~650 msec RTT

>
> > In this case $smtp_destination_concurrency_limit would help a lot...
>
> Limiting concurrency while still keeping mail going is expensive,
> memory wise; but it's part of being a good network citizen to not
> make 1000+ parallel connections to the same site.

 Would that include Hotmail/Yahoo/AOL and similar that probably have load
balancers behind every MX IP address ?

>
> Wietse
> -
>

-- 
	Rafi
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