Enabling TCP BBR
Linode
Linode Staff
I understand that I can boost network performance by enabling TCP BBR. I currently have Cubic enabled for kernal 5.4.10-x86_64-linode132.
Can you advise on any additional steps required for this Linode instance if I add two lines to /etc/sysctl.conf:
(net.core.default_qdisc=fq and net.ipv4.tcp_congestion_control=bbr)?
Is there anything else I need to do to make this change?
Thank you for your advise.
2 Replies
jecochard
Linode Staff
As I haven't personally tried to enable BRR, I gave it a shot on Ubuntu 16.04 and was successful with the help of this guide: Easily Boost Ubuntu Network Performance by Enabling TCP BBR.
A successful configuration will yield the below output from sudo sysctl -p:
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
I currently have Cubic enabled for kernal 5.4.10-x86_64-linode132
Based on this you shouldn't need to update your kernel, but if you do follow that step in the guide, it's important to note that you will need to reboot your Linode and make sure the Disk Configuration is booting with Grub2 as the kernel.
Hopefully this helps, but if you have any questions please reach out to us and we'd be happy to help.
Regards,
Josh E.
Linode Support Team
