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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.Hawaii.Edu!pith.uoregon.edu!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!su-news-hub1.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!news.mathworks.com!uunet!in2.uu.net!194.217.216.129!oaktree.co.uk!jon From: jon@oaktree.co.uk (Jon Ribbens) Newsgroups: comp.mail.sendmail,comp.mail.smail,comp.unix.bsd.freebsd.misc Subject: Re: Sendmail vs. Smail... Date: 23 Dec 1996 01:19:06 GMT Organization: Oaktree Internet Solutions Ltd. Lines: 33 Message-ID: <slrn5brnga.4fs.jon@black.oaktree.co.uk> References: <57tf61$gq7@raven.eva.net> <598tvm$t0h@ezekiel.eunet.ie> <1996Dec1821.08.45.5092@koobera.math.uic.edu> <59bjh9$fl1@ezekiel.eunet.ie> <1996Dec2000.07.45.5990@koobera.math.uic.edu> NNTP-Posting-Host: black.oaktree.co.uk X-Newsreader: slrn (0.9.0.0 (BETA) UNIX) Xref: euryale.cc.adfa.oz.au comp.mail.sendmail:35442 comp.mail.smail:2752 comp.unix.bsd.freebsd.misc:32866 D. J. Bernstein <djb@koobera.math.uic.edu> wrote: > > considerably more IP traffic > > False. Measurements have shown at three separate sites that switching > from sendmail to qmail _reduces_ traffic. But that's not what he said, is it? This discussion is about grouping RCPTs versus not grouping them, and changing from sendmail to qmail will change much more than just that. I *think* your argument is that because you have to wait for a reply after the 'RCPT TO' command, lots of them cause the mail to be very slow if there is a large RTT, whereas if you use many SMTP transactions at once then the long RTT waits are in parallel rather than in serial? Presumably you would therefore agree that RCPT grouping is much preferable if ESMTP pipelining is available? And you would also agree that, in the absence of pipelining, a dynamic system which tried to guess how many RCPTs should be grouped in a single transaction before the grouping becomes detrimental would be better than either never grouping or always grouping? Cheers Jon ____ \ // Jon Ribbens // 10MB virtual-hosted // www.oaktree.co.uk \// jon@oaktree.co.uk // web space for 49UKP //