How to check what congestion algorithm supported on my linux kernel?

Question

I want to enable google bbr on my VPS. But I don't know this feature is integrated on linux kernel or not. How can I check it?

Solution 1

Below command used to find the available tcp congestion control algorithms supported.

1. cat /proc/sys/net/ipv4/tcp_available_congestion_control

bic reno cubic

2. This command used to find which tcp congestion control configured for your Linux.

sysctl net.ipv4.tcp_congestion_control

3. Below command is used to change to desired one from the available list.

sysctl -w net.ipv4.tcp_congestion_control=bic

Solution 2

sysctl net.ipv4.tcp_available_congestion_control

Comments

[jesse_b]

Do you mind expanding on this answer a bit so that it is more clear for anyone that stumbles across this thread in the future?

[Gavin S. Yancey]

This is wrong. This gives the algorithm currently used, not all algorithms supported by the kernel

[Jack]

@GavinS.Yancey Yes, Kigo's answer looks better.