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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!news.unimelb.EDU.AU!munnari.OZ.AU!news.ecn.uoknor.edu!paladin.american.edu!zombie.ncsc.mil!news.mathworks.com!news.PBI.net!cbgw3.att.com!cbgw2.att.com!nntphub.cb.lucent.com!news From: "John S. Dyson" <dyson@inuxs.att.com> Newsgroups: comp.os.linux.networking,comp.unix.bsd.netbsd.misc,comp.unix.freebsd.misc Subject: Re: TCP latency Date: Thu, 27 Jun 1996 15:36:22 -0500 Organization: Lucent Technologies, Columbus, Ohio Lines: 28 Message-ID: <31D2F0C6.167EB0E7@inuxs.att.com> References: <4paedl$4bm@engnews2.Eng.Sun.COM> <4pf7f9$bsf@white.twinsun.com> <4qad7d$a5l@verdi.nethelp.no> <4qaui4$o5k@fido.asd.sgi.com> <4qc60n$d8m@verdi.nethelp.no> NNTP-Posting-Host: dyson.inh.lucent.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (X11; I; FreeBSD 2.1-STABLE i386) Xref: euryale.cc.adfa.oz.au comp.os.linux.networking:43760 comp.unix.bsd.netbsd.misc:3906 Steinar Haug wrote: > Pentium local 250 usec > AMD Linux local 330 usec > AMD FreeBSD local 350 usec > AMD Linux -> Pentium 420 usec > AMD FreeBSD -> Pentium 520 usec > > So the difference is quite noticeable. Wish I had another P133 here to > test with, but unfortunately I don't. > All this TCP latency discussion is interesting, but how does this significantly impact performance when streaming data through the connection? Isn't TCP a streaming protocol? Was TTCP used in these tests? I would think that if you were doing that many connections per second, TTCP would be better generally (like for WWW servers.) Isn't this just a connection latency? Hmmm... Data througput starts overshadowing connection latency quickly. Also, there is some latency that does not really imply CPU usage... Interesting data point, but really doesn't appear to impact system performance much if at all. Isn't meaningless benchmarking fun!!! John