How to Enable BBR on Rocky Linux 10

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BBR (Bottleneck Bandwidth and RTT) is a modern TCP congestion control algorithm developed by Google. It improves network throughput and reduces latency compared to older algorithms like Reno or CUBIC. Enabling BBR on Rocky Linux 10 can significantly improve performance for network-intensive applications.

Requirements

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• A system running Rocky Linux 10
• Root or sudo privileges
• Kernel version 4.9 or higher (Rocky Linux 10 ships with a compatible kernel)

Check Kernel Version

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uname -r

Output:

[root@vps ~]# uname -r
6.12.0-55.14.1.el10_0.x86_64

If your version is 4.9 or above, BBR can be enabled.

Check Available TCP Congestion Control Algorithms

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sysctl net.ipv4.tcp_available_congestion_control

Output:

net.ipv4.tcp_available_congestion_control = reno cubic

Check Current Algorithm in Use

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sysctl net.ipv4.tcp_congestion_control

Output:

net.ipv4.tcp_congestion_control = cubic

If bbr is not listed, it means it’s not enabled yet.

Enable BBR on Rocky Linux 10

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Edit the sysctl Configuration

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Open the sysctl config file:

vi /etc/sysctl.conf

Add the following lines at the bottom of the file:

net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr

Save and exit.

Apply the New Settings

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sysctl -p

Output:

net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr

Confirm BBR Is Active

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sysctl net.ipv4.tcp_congestion_control

Output:

net.ipv4.tcp_congestion_control = bbr

Optional: Verify BBR Is in Use by System Sockets

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lsmod | grep bbr

If the module is loaded, you’ll see something like:

tcp_bbr                20480  1

Conclusion

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BBR is now enabled on your Rocky Linux 10 system. This can lead to better performance for many networking tasks, particularly for servers or services that handle high-latency or bandwidth-sensitive traffic.