What is BBR
BBR is Google proposed a new congestion control algorithms, the Linux server can significantly improve throughput and reduce latency TCP connection.
BBR Project Address
Manually install, upgrade the kernel
Open BBR requires 4.10 or later of the Linux kernel, use the following command to view the current kernel version
uname -r
3.10.0-514.10.2.el7.x86_64
If the current kernel version lower than 4.10, you can use ELRepo Source Update:
http://elrepo.org/tiki/tiki-index.php
- Importing a public key
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
To install ELRepo 7 is RHEL-, SL- 7 or CentOS- 7:
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm</font>
To install ELRepo 6 is RHEL-, SL- 6 or CentOS- 6:
rpm -Uvh https://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm
ELRepo mirroring system to use, install yum-plugin-fastermirror simultaneously.
- Installing the kernel
yum --enablerepo=elrepo-kernel install kernel-ml -y
After the installation is complete, view the installed kernel:
rpm -qa | grep kernel
kernel-tools-3.10.0-957.1.3.el7.x86_64
kernel-3.10.0-957.1.3.el7.x86_64
kernel-3.10.0-957.el7.x86_64
kernel-tools-libs-3.10.0-957.1.3.el7.x86_64
kernel-ml-4.20.0-1.el7.elrepo.x86_64
See similar kernel-ml-4.20.0-1.el7.elrepo.x86_64 in the output, represents a successful installation.
- Modify grub2 guide
egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'
CentOS Linux (4.20.0-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-957.1.3.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-40b6222317d24a7690053e4070fadddb) 7 (Core)
As the numbers start with 0, set the kernel needs to start entry
grub2-set-default 0
reboot
After the reboot is complete, log back in and re-run the uname command to verify that you are using the correct kernel:
uname -r
Results are as follows the upgrade was successful:
4.20.0-1.el7.elrepo.x86_64
Open BBR
echo 'net.core.default_qdisc=fq' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_congestion_control=bbr' >> /etc/sysctl.conf
sysctl -p
Automatically install script
BBR script link https://raw.githubusercontent.com/teddysun/across/master/bbr.sh
curl -O https://raw.githubusercontent.com/teddysun/across/master/bbr.sh && sh bbr.sh
verification
View congestion control algorithms can be used
sysctl net.ipv4.tcp_available_congestion_control
got the answer
net.ipv4.tcp_available_congestion_control = reno cubic bbr
View congestion control algorithms now in use
sysctl net.ipv4.tcp_congestion_control
got the answer
net.ipv4.tcp_congestion_control = bbr
Check the BBR is operating properly
lsmod | grep tcp_bbr
tcp_bbr 20480 1
Speed Test
Create a file, set up http service
dd if=/dev/zero of=500mb.zip bs=1024k count=500 Visit http: // [your-server-IP] /500mb.zip to test the download speed ~
Author: Kokoronashi
link: https: //www.jianshu.com/p/62c9b9570c05
Source: Jane book
Jane book copyright reserved by the authors, are reproduced in any form, please contact the author to obtain authorization and indicate the source.