| title | description | category |
|---|---|---|
Bottleneck Bandwidth and Round-trip propagation time (BBR) |
Changing Congestion Control Algorithm |
advanced |
There's this shiny BBR congestion control! It is not universally accepted as a good solution according to Wikipedia, but it is an option to improve TCP throughput in some cases it seems.
This is currently only supported on Fedora and Debian. CentOS 8 also supports it, but we do not yet support CentOS 8.
Create the file /etc/sysctl.d/71-congestion.conf and put these lines in it:
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
To enable, use sysctl --system or reboot.
To verify it is configured properly:
$ /sbin/sysctl net.ipv4.tcp_congestion_control
net.ipv4.tcp_congestion_control = bbr
$ /sbin/sysctl net.core.default_qdisc
net.core.default_qdisc = fq