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From: shalunov@math.wisc.edu (stanislav shalunov)
Newsgroups: comp.mail.sendmail,comp.mail.smail,comp.unix.bsd.freebsd.misc
Subject: sendmail vs. qmail
Date: 13 Dec 1996 19:15:24 GMT
Organization: not really
Lines: 36
Distribution: world
Message-ID: <SHALUNOV.96Dec13131524@math.wisc.edu>
References: <57tf61$gq7@raven.eva.net> <589s2i$aro@raven.eva.net>
<58ffd7$op8@pacer.nlc.net.au> <58h6r1$8ik@ezekiel.eunet.ie>
<1996Dec1005.15.53.2968@koobera.math.uic.edu>
NNTP-Posting-Host: conley.math.wisc.edu
In-reply-to: djb@koobera.math.uic.edu's message of 10 Dec 1996 05:15:53 GMT
Xref: euryale.cc.adfa.oz.au comp.mail.sendmail:35142 comp.mail.smail:2703 comp.unix.bsd.freebsd.misc:32527
>>>>> `djb' == D J Bernstein <djb@koobera.math.uic.edu> has written:
>> Two extra complete SMTP negotiations and transmissions faster than a
>> single RCPT?
djb> Profile. Don't speculate. Your experience with serial mailers does
djb> not apply to programs handling several jobs at once.
I am sorry, but may I humbly ask for confirmation? Let us say that we
have, e.g., 5K message (with headers), and, e.g., addresses of normal
length, about 30 or 50 bytes.
Do you claim that opening 10 connections in parallel and transmitting
the same data (except RCPT line which doesn't affect data length much),
about 5K, is faster than transmitting the same 5K one time? Do you
claim that the worse is connection the more is gain?
And, furthermore, do you claim that you have proven it with actual
measurements?
That will be a good thing to know if you confirm this because you were
posting other measurements that you have performed and I was tending to
trust them.
P. S.: would you accept the following model of SMTP transmission: we
each time consume same bandwidth (no matter if we fail or succeed) and
we have constant probability p for given pair of hosts and given length
of message that connection will be successful and mail will be actually
delivered? If you do not accept it, please tell us what you would
accept.
--
Stanislav Shalunov, http://math.wisc.edu/~shalunov/ | shalunov@math.wisc.edu
PGP key fingerprint = 62367EA3D4D01D88E021F40A0D938E12 | public key on www page
Opinions that might have been represented here are just mine, not anyone else's
To err is computer's, to forgive--human.