Linux kernel 4.9 and above open TCP BBR congestion algorithm

Linux kernel 4.9 and above open TCP BBR congestion algorithm

BBR the goal is to try to run full bandwidth, and try not to have a queuing situation, the effect is not faster than the speed of sharp difference

Linux kernel 4.9+ has supported TCP_BBR below to briefly describe how a KVM-based architecture VPS is powered on

Install Linux kernel version 4.9 and above

General installation of the latest version of the kernel

Debian 8+/Ubuntu 14.04

• Download the latest kernel

# wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14.12/ Linux-image-4.14.12-041412-generic_4.14.12-041412.201801051649_amd64.deb

• Installing the kernel

# dpkg-i linux-image-4. *.deb

• Deleting legacy kernels (optional)

grep linux-image # apt-get purge old kernel

• Update grub and restart server

# update-grub# reboot

Ubuntu16.04

• Install Hardware enablement Stack (HWE), update kernel automatically

Install --install-recommends linux-generic-hwe-16.04

• Deleting legacy kernels (optional)

# apt Autoremove

• Restart the server to enable the latest kernel

# reboot

centos6.x

• Enable Elrepo source and install Kernel-ml

# RPM--import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org# RPM-UVH http://  www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpmYuminstall kernel-ml-y

• Check if the kernel is already installed

grep Kernel

• Update grub and restart server

sed ' s:default=.*:d efault=0:g ' /etc/grub.conf# reboot

centos7.x

• Enable Elrepo source and install Kernel-ml

# RPM--import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org# RPM-UVH http://  www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpmYuminstall kernel-ml-y

• Check if the kernel is already installed

# Rpm-qa | grep kernel

• Update Grub2.cfg

# Grub2-mkconfig-o/boot/grub2/grub.cfg

• Restarting the server

# reboot

Check kernel version

Check if the kernel version is greater than 4.9 with the uname-r command

uname -R

Enable BBR congestion algorithm

• Loading kernel modules

Modprobeecho"tcp_bbr" >>/etc/modules-load.d/ Modules.conf

• modifying kernel parameters

Echo " NET.CORE.DEFAULT_QDISC=FQ " >>/etc/echo"net.ipv4.tcp_congestion_control=bbr " >>/etc/sysctl.conf
# sysctl-p

• Check if BBR is turned on

Lsmod grep bbr# sysctl net.ipv4.tcp_available_congestion_control# sysctl Net.ipv4.tcp_congestion_control

If the result has bbr, it means that the BBR algorithm has been turned on

Linux kernel 4.9 and above open TCP BBR congestion algorithm