Path: utzoo!mnetor!uunet!ingr!b11!xenon!goodloe
From: goodloe@xenon.UUCP (Tony Goodloe)
Newsgroups: comp.dcom.lans
Subject: Re: Re: Ethermet Utilisation
Message-ID: <48@xenon.UUCP>
Date: 2 May 88 20:56:57 GMT
Organization: Intergraph Corp. Huntsville, AL
Lines: 16
Keywords: ugh.


I feared that my posting didi make it to the net in its entirety, and I can
see now that it must not have. My question was "what maximum utilization
can one expect to see on an Ethernet?" I know that a csma/cd net is
non-deterministic, that's why the question exists, otherwise I could
determine it :) I was looking for more sources like "Performance of an
Ethernet Local Netwotk: A Preliminary Report" by Shoch and Hupp  or
"Performance Analysis of CSMA/CDD" by Tobagi and Hunt. I haven't made it
through Tobagi and Hunt, but according to Shoch and Hupp they have seen
a maximum of ~98% utilization down to maximum ~60% utilization depending on the
test conditions. Read the article for more info. I was looking for more
info like this, or real live experience. Our net gets up to about 35%
and we do have individual nodes capable of more. What I am curious about
is what people have seen or caculated (using statistical means (no pun
intended)) on other nets with lots of these beasts on them. Maybe this
posting will make it out in one piece.