[175727] in North American Network Operators' Group
Re: Industry standard bandwidth guarantee?
daemon@ATHENA.MIT.EDU (Bruce A. Mah)
Thu Oct 30 13:22:20 2014
X-Original-To: nanog@nanog.org
Date: Thu, 30 Oct 2014 10:20:12 -0700
From: "Bruce A. Mah" <bmah@kitchenlab.org>
To: keith tokash <ktokash@hotmail.com>,
"Valdis.Kletnieks@vt.edu" <valdis.kletnieks@vt.edu>
In-Reply-To: <BAY172-W147EE834C0FDCC210E4A7AAE9C0@phx.gbl>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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If memory serves me right, keith tokash wrote:
> I'm sorry I should have been more specific. I'm referring to the
> *percentage* of a circuit's bandwidth. For example if you order a
> 20Mb site to site circuit and iperf shows 17Mb. Well ... that's 15%
> off, which sounds hefty, but I'm not sure what's realistic to expect.
This doesn't exactly answer your original question, but...
iperf (as well as its follow-on, iperf3) runs between two end hosts, so
an iperf test will be measuring other effects, such as congestion (as
others have pointed out), but also end-host tuning, the LANs to which
the end hosts are attached, etc.
${WORK} maintains a good reference to tuning networks for
high-performance R&E networks...some of these techniques are applicable
to other environments as well.
http://fasterdata.es.net/
Bruce.
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