centos7 改用BBR内核

wget http://mirrors.kernel.org/debian/pool/main/l/linux/linux-image-4.9.0-rc8-amd64-unsigned_4.9~rc8-1~exp1_amd64.deb
ar x linux-image-4.9.0-rc8-amd64-unsigned_4.9~rc8-1~exp1_amd64.deb
tar -Jxf data.tar.xz


install -m644 boot/vmlinuz-4.9.0-rc8-amd64 /boot/vmlinuz-4.9.0-rc8-amd64


cp -Rav lib/modules/4.9.0-rc8-amd64 /lib/modules/
depmod -a 4.9.0-rc8-amd64
#centos >= 6
dracut -f -v --hostonly -k '/lib/modules/4.9.0-rc8-amd64'  /boot/initramfs-4.9.0-rc8-amd64.img 4.9.0-rc8-amd64

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

重启即可下面的不用了

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf


echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf

 sysctl -p