TCP BBR is a TCP congestion control algorithm developed by Google. It tackles shortcomings of traditional TCP congestion control algorithms (Reno or CUBIC). According to Google, it can achieve orders of magnitude higher bandwidth and lower latency. TCP BBR is already being used on Google.com, YouTube and Google Cloud Platform and the Internet Engineering Task Force (IETF) has been standardizing this algorithm Since July, 2017. BBR stands for Bottleneck Bandwidth and RTT.
BBR requires only changes on the sender side. You can enable TCP BBR on your Linux desktop to improve overall web surfing experience. If you have a Linux web server, TCP BBR can achieve faster web page downloads for your website visitors.
TCP BBR is supported by Linux since kernel version 4.9. Use the following command to check your Linux kernel version.
uname -r
Once you have kernel 4.9 or above, edit sysctl.conf file.
sudo nano /etc/sysctl.conf
Add the following two line at the end of the file.
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
Save and close the file. Then reload sysctl configurations.
sudo sysctl -p
Congrats! You have successfully enabled TCP BBR on Ubuntu.
You can check the congestion control algorithm in use with:
sysctl net.ipv4.tcp_congestion_control
Frank Lin
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