Re: [bbr-dev] How to specify the BBR Congestion Control Algorithm for each port

[Holger Hoffstätte]

On 2021-12-11 19:12, Dhvit Mehta wrote:
> I want to know if I can allow only a few ports to use BBR, I want to
> run Cubic or any other algorithm on the other ports
>
> As far as I know once BBR is enabled using the systctl method it will
> be used for all TCP connections on the sender side

AFAIK the only other way to configure a specific connection on a specific port
is using setsockopt(socket, IPPROTO_TCP, TCP_CONGESTION, ...);

For a complete example see:
https://stackoverflow.com/questions/59265004/how-to-change-tcp-congestion-control-algorithm-using-setsockopt-call-from-c

-h

[Neal Cardwell]

You can use a BPF program to do that sort of thing. Here's an example BPF program to set the congestion control algorithm based on the port number and IP address range: 

 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/samples/bpf/tcp_cong_kern.c

neal

On Sat, Dec 11, 2021 at 1:12 PM Dhvit Mehta <icm20...@iiita.ac.in> wrote:

I want to know if I can allow only a few ports to use BBR, I want to run Cubic or any other algorithm on the other ports

As far as I know once BBR is enabled using the systctl method it will be used for all TCP connections on the sender side

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