Return to BSD News archive
Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!lll-winken.llnl.gov!hookup!usenet.eel.ufl.edu!news.ultranet.com!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!svc.portal.com!news1.best.com!blob.best.net!not-for-mail
From: dillon@best.com (Matt Dillon)
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: 9 Aug 1995 12:05:43 -0700
Organization: Best Internet Communications, Inc. (info@best.com)
Lines: 58
Distribution: world
Message-ID: <40b0u7$jp6@blob.best.net>
References: <3vtsbe$hmc@alpha.aladdin.co.uk>
NNTP-Posting-Host: blob.best.net
Xref: euryale.cc.adfa.oz.au comp.os.linux.networking:11615 comp.os.ms-windows.networking.tcp-ip:13787 comp.unix.bsd.freebsd.misc:4544
:In article <3vtsbe$hmc@alpha.aladdin.co.uk>, <chris@aladdin.net> wrote:
:>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
Well, if ftp.cdrom.com is anything like our WWW server, most of the
packet *volume* is one-way. We get about 1.4 million hits a day
now on www.best.com (and are about to move to a round-robin scheme
and a second server as well as upgrade the poor overloaded P90
to a P130)
The TCP stats say it all... OOPS! looks like the counters have
turned over a couple of times, netstat -s is kinda useless.
Well, here's something better:
ep0 ep0
in out
pkts bytes b/p %util pkts bytes b/p %util
392 32923 83 511 221171 432
377 33056 87 470 196247 417
406 34701 85 486 216994 445
452 37634 83 544 245715 451
399 35498 88 475 208366 438
So you see, the outgoing traffic beats the incoming traffic
by a ratio of 6:1. I would expect that ftp.cdrom.com would
have an even larger ratio... and much more traffic. We are
only pushing 200-300 KBytes/sec all day long.
-Matt
--
Matthew Dillon VP Engineering, BEST Internet Communications, Inc.
<dillon@best.com>, <dillon@apollo.west.oic.com>
[always include a portion of the original email in any response!]