 TCP congestion control version: HTCP module vs highspeed module in linux kernel. I found that, in Linux, there are many loadable modules for congestion control If I change system wide TCP congestion control algorithm as shown below, does it affect already established connections also ?Đang xem: Best tcp congestion control. Alright, we all know the difference between the two most popular transport protocols used on the Internet today. Bottleneck Bandwidth and Round-trip propagation time (BBR) is a TCP congestion control algorithm developed at Google in 0000. Đang xem: Best tcp congestion control. Alright, we all know the difference between the two most popular transport protocols used on the Internet today. Bottleneck Bandwidth and Round-trip propagation time (BBR) is a TCP congestion control algorithm developed at Google in 0000.