1. Check the machine kernel
BBR algorithms need to Linux 4.9 and above kernel support, so I want to use this method need to upgrade the kernel version.
Linux kernel on Cent OS 7 is 3.10, using the uname -r core edition
[root@iZ2ze83hhomw2zcf15c3qcZ ~]# uname -r 4.14.3-1.el7.elrepo.x86_64
2. Check whether to open bbr
# sysctl net.ipv4.tcp_available_congestion_control
To be output similar to the following, BBR in front
net.ipv4.tcp_available_congestion_control = bbr cubic reno
3. Does the display bbr loaded system module
As shown below, the load proved successful
# lsmod | grep bbr tcp_bbr 16384 0
4.bbr open method
Check the sudo wget --no-#-Certificate https://github.com/teddysun/across/raw/master/bbr.sh bbr.sh && && the chmod + X ./ bbr.sh # sysctl net.ipv4.tcp_available_congestion_control # see if the kernel is on BBR # lsmod | grep BBR # View BBR whether to start # take effect after reboot reboot
5.bbr close method
Vi /etc/sysctl.conf # # Run # net.core.default_qdisc = fq comment out with # # net.ipv4.tcp_congestion_control = BBR commented out with # # lsmod | grep BBR # View BBR whether to start # reboot # reboot the server to