For my fellow networking nerds – Great description of the complexity of flow control. It is interesting to see how BBR does in the presence of other methods (CUBIC, Vegas, Reno, etc). Of course in the Linux world the TCP FC algorithms are in a state of constant tweakness, so in a given network there are probably sample of all of them running.

https://blog.apnic.net/2017/05/09/bbr-new-kid-tcp-block/