Measurement-wise, I see similar results with netperf vs irtt in my Gbit LAN 
with BQL and 'cake besteffort lan' test, with irtt having a slightly higher 
mean and maximums, as might be expected. This is something I might be able to 
improve. I'll try playing with chrt when I have time.

On the positive side(?), with irtt, I don't see the 'latency locking' effect 
that I see with netperf, where for whatever reason, certain flows would stay 
more fixed in some position relative to the mean. Also, in these runs, the 
download throughput was somewhat less with netperf, but not with irtt.

![rrul_be_irtt](https://user-images.githubusercontent.com/4397233/32887936-e14f11bc-cac5-11e7-96c0-63e7a7a3db17.png)
![rrul_be_netperf](https://user-images.githubusercontent.com/4397233/32887937-e16cf2d6-cac5-11e7-8ae3-ff7734bc9578.png)

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