On Mar 26, 2005, at 2:01 PM, John H. Robinson, IV wrote:
From the README.PERFORMANCE from zmailer2.99.57pre3:
A colleque of mine ran a recent ZMailer (2.99.44 I presume) between
two PPro-200 Linux machines over a dedicated 10base-T ethernet.
He submitted messages at host-A into router as fast as he could,
and routed them all to host-B over SMTP to /dev/null there.
The transfer-rate at the Host-A was about 500 000 per hour;
or 10-12 million per day... The test was run for two hours to
measure true throughput figures, not only bursts!
(Heard about this on 3-Feb-97.)
Hmmm, that would imply that each message is at most 73K in size or you would swamp the 10baseT throughput. That probably isn't a good assumption for a truly large email system (which will have lots of attachments). Bandwidth will probably be a bigger bottleneck than compute speed.
I seem to recall that the zmailer stuff also required an adjustment to the TCP/IP stack defaults to avoid that being the bottleneck.
I'm not going to argue that zmailer isn't the fastest; however, I would argue that modern machines are probably *way* fast enough to handle by default any corporate email load short of a Fortune 500 company on any mailer choice.
-a
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