centos7开启bbr加速黑科技
BBR是来自Google的黑科技，通过优化和控制TCP的拥塞，充分利用带宽并降低延迟，起到神奇的加速效果。
测试环境
centos7.5
加速效果，没有那么跨张，但是下载从50K加速到400K
下载更换内核
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.rpm yum --enablerepo=elrepo-kernel install kernel-ml -y
查看内核是否安装成功
rpm -qa | grep kernel
更新 grub 系统引导文件并重启
egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \' grub2-set-default 0 # default 0 表示第一个内核设置为默认运行, 选择最新内核就对了 reboot
开机后看看是不是内核 >= 4.9
uname -r
执行 lsmod | grep bbr，如果结果中没有 tcp_bbr 的话就先执行
modprobe tcp_bbr echo "tcp_bbr" | sudo tee --append /etc/modules-load.d/modules.conf
配置内和bbr
echo "net.core.default_qdisc=fq" | sudo tee --append /etc/sysctl.conf echo "net.ipv4.tcp_congestion_control=bbr" | sudo tee --append /etc/sysctl.conf sysctl -p
查看内和是否启动bbr
sysctl net.ipv4.tcp_available_congestion_control sysctl net.ipv4.tcp_congestion_control
如果结果都有 bbr, 则证明你的内核已开启 bbr
查看tcp_bbr是否启动
执行 lsmod | grep bbr, 看到有 tcp_bbr 模块即说明 bbr 已启动
参考资料
https://github.com/iMeiji/shadowsocks_install/wiki/%E5%BC%80%E5%90%AFTCP-BBR%E6%8B%A5%E5%A1%9E%E6%8E%A7%E5%88%B6%E7%AE%97%E6%B3%95
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