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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!news.uoregon.edu!hammer.uoregon.edu!newsgate.cuhk.edu.hk!news.hk.net!howland.erols.net!news.mathworks.com!uunet!in2.uu.net!128.248.178.247!koobera.math.uic.edu!djb From: djb@koobera.math.uic.edu (D. J. Bernstein) Message-ID: <1996Dec1321.21.47.28981@koobera.math.uic.edu> Date: 13 Dec 1996 21:21:47 GMT Newsgroups: comp.mail.sendmail,comp.mail.smail,comp.unix.bsd.freebsd.misc Subject: Re: sendmail vs. qmail References: <57tf61$gq7@raven.eva.net> <58h6r1$8ik@ezekiel.eunet.ie> <1996Dec1005.15.53.2968@koobera.math.uic.edu> <SHALUNOV.96Dec13131524@math.wisc.edu> Organization: IR Lines: 30 Xref: euryale.cc.adfa.oz.au comp.mail.sendmail:35174 comp.mail.smail:2706 comp.unix.bsd.freebsd.misc:32578 stanislav shalunov <shalunov@math.wisc.edu> wrote: > 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? It depends. There are literally dozens of variables that you've failed to specify. > Do you claim that the worse is connection the more is gain? What do you mean by ``worse''? Lower bandwidth? Higher traffic? Higher line latency? Higher packet drop rate? Higher bit error rate? Higher round trip time? Higher SMTP server latency? Higher overall server load? Higher DNS latency? Lower DNS hit percentage? Or something else? > And, furthermore, do you claim that you have proven it with actual > measurements? I don't know what you mean by ``it.'' What are you referring to? If you don't understand something I've said, please quote it. > P. S.: would you accept the following model of SMTP transmission: What do you mean by ``accept''? If you mean ``would you blindly assert that the following absurdly simple and incredibly vague model of SMTP transmission produces accurate estimates of any quantity related to mail traffic?'' then the answer is no. ---Dan Put an end to unauthorized mail relaying. http://pobox.com/~djb/qmail.html