Return to BSD News archive
#! rnews 1967 sserve.cc.adfa.oz.au Xref: sserve comp.os.linux.networking:11311 comp.os.ms-windows.networking.tcp-ip:13587 comp.unix.bsd.freebsd.misc:4298 Path: sserve!euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!news.kei.com!news.mathworks.com!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!uknet!SoNet!news From: chris@aladdin.net Newsgroups: comp.os.linux.networking,comp.os.ms-windows.networking.tcp-ip,comp.unix.bsd.freebsd.misc Subject: Re: Internet service providing-which OS? Date: 4 Aug 1995 19:27:42 GMT Organization: Aladdin Internet Lines: 25 Distribution: world Message-ID: <3vtsbe$hmc@alpha.aladdin.co.uk> NNTP-Posting-Host: me.aladdin.co.uk X-Newsreader: <WinQVT/Net v3.9> In article <B.A.MCCAULEY.95Aug3145624@wcl-l.bham.ac.uk><3upmq7$11f@agate.b, B.A.McCauley@bham.ac.uk writes: >In article <3us870$15o@agate.berkeley.edu> jkh@violet.berkeley.edu (Jordan K. Hubbard) writes: >>In article <3urba1$cgl@blob.best.net>, Matt Dillon <dillon@best.com> wrote: >>> Gentlemen. If I remember correctly, ftp.cdrom.com is sitting on >>> a BARRNET T3 backbone and, on average, pulls about 6 MBytes / sec >>> in bandwidth. That's on the order of 4 T1 equivalences! >> >>It's on the T3 backbone, but is connected to same via a 10mb/sec ethernet >>connection which it pretty much maxes out. 1 T1 = 1.54 Mb, yes? So >>saying that 10Mb = 7 T1s is not that poor of an approximation. > >Actually I think Ethernet = 2 T1s is a better approximation. I seem to >recall that with a random traffic profile CSMA/CD (ethernet) actually >saturates with an average traffic at 1/e (about 37%) of the burst >transfer rate. Beyond that, the collision retry queues just keep on >growing. You also have to remember that T1 is 1.5 MB bi-directional and ethernet is 10 MB total, so even best case it's only 3xT1 = Ethernet if there is equal traffic each way (course this is probably not the case on ftp.cdrom.com) Chris Cain