Linux,内核升级

yum -y update
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
sudo awk -F' '2}' /etc/grub2.cfg
grub2-set-default 0 或编辑 /etc/default/grub :GRUB_DEFAULT=0
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
reboot

开启bbr
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
sudo sysctl -p

验证bbr:
sudo sysctl net.ipv4.tcp_available_congestion_control
输出应为 net.ipv4.tcp_available_congestion_control = bbr cubic reno
sudo sysctl -n net.ipv4.tcp_congestion_control
输出应为 bbr
lsmod | grep bbr
输出应类似 tcp_bbr 16384 28