Re: UDP Throughput Definition

To: iperf-users --at-- dast.nlanr.net

Subject: Re: UDP Throughput Definition

From: "Reginald Smith" <rsmith --at-- sloan.mit.edu>

Date: Fri, 8 Feb 2008 16:23:53 -0500

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Thanks for the advice. This will help me undestand my data much better.

Reggie

On 2/7/08, Marc Herbert <Marc.Herbert --at-- free.fr> wrote:

2008/2/5, Reginald Smith <rsmith --at-- sloan.mit.edu>:
> I am using iperf in a network measurement experiment and I want to know if
> for the UDP measurements of throughput/total bytes sent and received are
> header bytes from Ethernet frames, UDP, and IP included or excluded from
> throughput measurements? Thanks for any help.

This looks like a Frequently Asked Question. However I could not find
it in the FAQ. Yet?

It can be found in the list archive:
<http://www.google.com/search?hl=fr&q=site%3Aarchive.ncsa.uiuc.edu++headers+rate>

There is no portable and reliable way to know the size of the headers
of lower layers. For instance TCP and UDP can run on non-Ethernet
networks.

AFAICT, iperf does NO random guesses at lower layers. It just
precisely reports what it sees: user data transfered.

rsmith --at-- sloan.mit.edu