修改系统变量

sudo dpkg-reconfigure -plow unattended-upgrades
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl -p

保存生效

sysctl -p

查看内核是否已开启BBR

sysctl net.ipv4.tcp_available_congestion_control

或者

lsmod | grep bbr