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Re: shaper or whatever

daemon@ATHENA.MIT.EDU (Alan Cox)
Tue Jun 25 07:03:26 1996

From: Alan Cox <alan@cymru.net>
To: dennis@etinc.com (Dennis)
Date: 	Tue, 25 Jun 1996 10:09:22 +0100 (BST)
Cc: alan@cymru.net, linux-net@vger.rutgers.edu
In-Reply-To: <199606242019.QAA17300@etinc.com> from "Dennis" at Jun 24, 96 04:19:44 pm

> What we're doing is speed simulation so ISPs can do web and host 
> serving on an ethernet and charge for bandwidth usage, or so that
> companies can share an ethernet and allocate only certain amounts
> of bandwidth to each "user". For example if you had a T1 and you
> wanted to put the company next door on you LAN but they only needed
> 56kbs, rather than putting up back-to-back routers you can just run
> an ethernet and limit the bandwidth on the ethernet. Easier, cheaper
> and more efficient (hopefully).

Its only efficient if your model is ok. The question thats critical is "What
throughput do I get over a 56K link and do I get the same throughput over my 
56K limited ethernet". Here throughput is not bits/second its transactions,
ftp data rate - tangible performance items. If the traffic shaper means I
still get 56Kbit put I get 2/3rd of the ftp performance of a real 56K line
then you can forget it.

Alan



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