[Codel] iperf3 udp flood behavior at higher rates

[Rick Jones]

On 05/02/2016 04:18 PM, Dave Taht wrote:
> Netperf does not have a multi-hop capable udp flood test (rick jones
> can explain why... )

Well, with an intro like that, how could I refuse?-)

In a nutshell, after repeated uses of the netperf UDP_STREAM test in 
non-air-gapped test setups with link up/down testing and a default route 
which pointed at the local "corporate/desktop/whathaveyou" network by QA 
engineers who should have known better, taking-out things like security 
camera video feeds, by default the data socket for a UDP_STREAM test is 
set SO_DONTROUTE.  This can be overridden with a test-specific -R 1 option.

This is not necessary if the test is UDP_RR or TCP_*.

happy benchmarking,

rick jones