The network is bumpy, especially during late peak hours.
We will inevitably experience slow speeds when accessing foreign servers.
If our server is a Linux system, fortunately, the kernel version of the Debian 9 system is 4.9.x.
The kernel comes with BBR congestion algorithm developed by Google, we can easily start BBR to accelerate access.
Debian 9 turns on Google BBR congestion control algorithm:
vi /etc/sysctl.conf
Add contents as following to sysctl.conf:
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
reload sysctl:
sysctl -p
If there is no error message in the sysctl you should reboot Debian 9 to make it work.
reboot
After reboot Enter command:
lsmod |grep bbr
It show something like as following means it worked.
root@localhost:~# lsmod |grep bbr
tcp_bbr 16384 21
