enable google bbr

enable_bbr.sh

#!/bin/bash

# get the latest linux kernel at http://kernel.ubuntu.com/~kernel-ppa/mainline/
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc6/linux-image-4.14.0-041400rc6-generic_4.14.0-041400rc6.201710230731_amd64.deb

# install the kernel
dpkg -i linux-image-4.*.deb

# update grub
# for linode, change kernel in boot settings to GRUB 2
update-grub
reboot

# check bbr
lsmod | grep bbr

# if no tcp_bbr found in the last step, enable it manually
modprobe tcp_bbr
echo "tcp_bbr" >> /etc/modules-load.d/modules.conf

# update sysctl
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl -p

# last check
sysctl net.ipv4.tcp_available_congestion_control
sysctl net.ipv4.tcp_congestion_control
lsmod | grep bbr