How to Enable BBR on CentOS Stream 9
BBR stands for Bottleneck Bandwidth and RTT is a congestion control system. You can enable TCP BBR on your Linux desktop to improve the overall web surfing experience. By default, Linux uses the Reno and CUBIC congestion control algorithm.
Requirements:
BBR requires Linux kernel version 4.9 or above. Since CentOS Stream 9 comes with Linux kernel 5.14.0, we can enable BBR right away.
Run the following command to check available congestion control algorithms,
sysctl net.ipv4.tcp_available_congestion_control
Run the below command to check the current congestion control algorithm used in your system,
sysctl net.ipv4.tcp_congestion_control
Enabling TCP BBR in CentOS
Open the following configuration file vi /etc/sysctl.conf to enable TCP BBR.
vi /etc/sysctl.conf
At the end of the config file, add the following lines.
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
Save the file, and refresh your configuration by using this command,
sysctl -p
Now, Verify if BBR is enabled in your system,
sysctl net.ipv4.tcp_congestion_control
Now you have successfully enabled BBR on CentOS Stream 9.
