Debian 9 enables Google BBR to achieve TCP acceleration

Since the default 4.9 kernel of Debian9 compiles the contents of TCP BBR, it can be turned on directly through parameters.

The following are all operated under SSH, preferably the root user. 1. Modify system variables

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf

2. Save to take effect

sysctl-p

3. Check whether the kernel has enabled BBR

sysctl net.ipv4.tcp_available_congestion_control

The following content is displayed to indicate that it is enabled:

sysctl net.ipv4.tcp_available_congestion_control net.ipv4.tcp_available_congestion_control = bbr cubic reno

4. BBR should have been started through the above operations. Check again to see if BBR is started.

lsmod | grep bbr

The startup is successful when the following is displayed:

lsmod | grep bbr tcp_bbr 20480 14

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