Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!umd5!uvaarpa!mcnc!decvax!ucbvax!THUMPER.BELLCORE.COM!karn
From: karn@THUMPER.BELLCORE.COM (Phil R. Karn)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  PSN 7 End-to-End question.
Message-ID: <8802032211.AA26545@thumper.bellcore.com>
Date: 3 Feb 88 22:11:28 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 26

We're on a 56Kb/s HDH link to the Columbia IMP, and Stuart's figures are
consistent with mine. I spent some time analyzing the HDLC link level on
our Sun gateway to make sure it's not the bottleneck. As far as I can
tell, it isn't. We're running in message mode (does anybody even bother
with packet mode?), with zero acknowledgement delay and a window size of
7.

Yes, Dave, the tests were done between Columbia and UDel, but I wouldn't
expect such consistent numbers if heavy loading at Delaware was the cause.

While we're on the subject of network throughput, I came across an
interesting statistic the other day. The French national packet network
carries 1,200 billion characters/month, "more than three times the
traffic of Tymnet, Telenet and all other American networks combined...
In fact, France accounts for more data traffic than all the rest of the
world's nations combined..."  ["Tout le Monde! C'est Telematique
Francaise!", US Black Engineer, Winter 1987, p.5].

While this certainly *sounds* impressive, 1.2 terabytes/month is only
3.7 megabits/sec, roughly 40% of a single Ethernet.  We routinely see
cables around here running at such levels for sustained periods (NFS/ND
traffic between Sun-3's, naturally).  Add up all the LANs in the world
and even France's awesome network capacity withers into insignificance. 
Now all we need is a long-haul packet network with a capacity matched to
that of tomorrow's LANs so we can have national NFS server banks...

Phil