How to enable native Google BBR in CentOS 7/Debian 9 to achieve TCP acceleration

New kernels such as CentOS 7/Debian 9 all come with BBR, which is directly enabled and safe.

1. Enable native Google BBR on CentOS 7

(1) Update the CentOS 7 kernel to support BBR

1. View Centos kernel

uname -r

2. If it is lower than 4.10, update the kernel

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm yum --enablerepo=elrepo-kernel install kernel-ml -y

3. After the installation is complete, check the installed kernel:

rpm -qa | grep kernel

If you see the words kernel-ml-5.3.5-1.el7.elrepo.x86_64, it is successful. 4. Update startup

egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'

You will see something like this

CentOS Linux (5.3.5-1.el7.elrepo.x86_64) 7 (Core) CentOS Linux (3.10.0-957.1.3.el7.x86_64) 7 (Core) CentOS Linux (0-rescue-96820b9851c24560b5f942f2496b9aeb) 7 (Core)

Set CentOS Linux (5.3.5-1.el7.elrepo.x86_64) 7 (Core) as the first startup sequence (because startup is calculated from 0)

grub2-set-default 0

5. Restart the system

reboot

(2) Enable BBR on CentOS 7

1. Execution

echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf sysctl -p

2. Check whether the kernel has enabled BBR

sysctl net.ipv4.tcp_available_congestion_control

and

lsmod | grep bbr

If the words BBR are displayed, it means that BBR is successfully enabled.

2. Debian 9 enables native Google BBR

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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