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Date: Wed, 10 Oct 2012 16:29:11 -0700
From: Stephen Hemminger <shemminger@vyatta.com>
To: Michael Richardson <mcr@sandelman.ca>
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	codel@lists.bufferbloat.net, bloat@lists.bufferbloat.net
Subject: Re: [Bloat] [Codel] better testing, linux 3.6.1, cerowrt credits,
 other stuff
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On Wed, 10 Oct 2012 19:27:11 -0400
Michael Richardson <mcr@sandelman.ca> wrote:

> 
>     >> But: It became obvious fast that long RTT tests were needed,
>     >> which I've been trying to establish the infrastructure to do
> 
>     toke> I assume that by "infrastructure" you mean "(netperf) servers
>     toke> far away"? What would be needed for a test server in terms of
>     toke> resources (bandwidth and otherwise)? I could try and persuade
>     toke> my university to let me setup a test server on their network
>     toke> (which is in Denmark)...
> 
> I interpret the question to mean networks where is there significant
> actual delay along them.  I seem to recall that there are some ways to
> do this Linux machines, but most commercial test equipment can simulate
> things, including dropping packets.
> I think, however, that we do not want/need and packets dropped, as then
> the bandwidth constraint would not be in the device under test.

netem can do all the stuff commercial gear can.
In fact, it is used by one of the commercial products!