[10619] in North American Network Operators' Group
Re: ATM vs. DS3
daemon@ATHENA.MIT.EDU (Alex.Bligh)
Fri Jul 11 05:39:41 1997
To: Karl Denninger <karl@mcs.net>
cc: "Chris A. Icide" <chris@nap.net>, "'Josh Beck'" <jbeck@connectnet.com>,
"nanog@merit.edu" <nanog@merit.edu>
In-reply-to: Your message of "Wed, 09 Jul 1997 22:52:00 CDT."
<19970709225200.40146@Jupiter.Mcs.Net>
Date: Fri, 11 Jul 1997 10:15:55 +0100
From: "Alex.Bligh" <amb@xara.net>
> I've used 20% as the general ATM overhead now for almost two years, and have
> been poo-pooed by lots of people claiming that it wasn't anywhere near that
> bad.
Our inhouse figure is 23%. That was an empirical test of a traffic
generator comparing performance to Cicso HDLC. This might be slightly
pessimistic as Cisco traffic shaping (yes, even though you can't
see it, it is there working) is really very aggressive and with bursty
traffic it tends to prefer underfilling the line to overfilling it.
Alex Bligh
Xara Networks
