[net-perf] bwctl testing

[Mark Boolootian]

> To help satisfy my curiosity about the physical path, I rooted through
> the rancid configs and cobbled together the attached picture of what I
> think the HPR path is between UCI and UCLA via SDG-HPR.

I'm a little confused by the arrows in your diagram.  They seem to imply
that traffic from UCI to UCLA flows via the SBC gigaman connection.  Or
am I misinterpreting these guys?