A talk describing Google’s new TCP congestion control algorithm, BBR, is now online.

Such a beautiful and simple solution to a long standing problem. This one of those situations when you have to wonder why this wasn’t done before.

On a related note, it’s interesting how BBR separates the retransmission and congestion control (rate) logic. There is a section in An Engineering Approach to Networking where the author specifically calls out that it’s easier to solve both problems if they are considered separately vs. using the retransmission window size to control the rate as most TCP congestion control solutions do. This struck me as very interesting and I’m excited to see it demonstrated by sch_fq and BBR now.