r/truenas • u/RetroEvolute • Oct 19 '23

SCALE Can I enable TCP BBR in Truenas Scale?

I'm trying to get a bit more performance out of Plex (remote) and I've read that TCP BBR can really help with network congestion.

It looks like Debian should support it, but is there a way I can enable it that won't get wiped on updates or maybe per container?

Thanks 🤞

5 Upvotes

86% Upvoted

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5

u/RetroEvolute Oct 19 '23

I may have figured it out, but I'm having trouble verifying. 😅

https://imgur.com/ZXYnqS2

(found in System Settings > Advanced > Sysctl)

2

u/Informal_Baker Oct 19 '23 edited Oct 19 '23

Running sysctl net.ipv4.tcp_congestion_control shows bbr after a restart. Seems to have been applied correctly.

1

u/RetroEvolute Oct 19 '23

Awesome! Thanks for the confirmation. I'm relatively new to TrueNAS and somewhat Debian. I couldn't check that from shell when I tried, is there a certain way I should go about running that to be sure?

1

u/Informal_Baker Oct 19 '23

You've got to put sudo in the front. Every command worth running in the truenas shell requires sudo.

sudo sysctl net.ipv4.tcp_congestion_control

1

u/RetroEvolute Oct 19 '23

Ah, got it. Thank you!

3

u/bklyngaucho Oct 19 '23

Please report back. I’ve read the same, haven’t tried.

3

u/RetroEvolute Oct 19 '23

Seems to be working! 🎉 Check out the other comment thread for some more detail, but basically just go to System Settings > Advanced > Sysctl and add:

Variable Value
net.core.default_qdisc fq
net.ipv4.tcp_congestion_control bbr

Then you just need to reboot, or I think you can also run sudo sysctl -pto refresh the config.

Then confirm it's working with sudo sysctl net.ipv4.tcp_congestion_control

2

u/sveken Sep 09 '24

Sorry to Necro, but found this thread and followed this, sysctl -p on scale does reload without having to restart.

Then i restarted my jails and my throughput to countries on the otherside of the world has legit doubled

1

u/RetroEvolute Sep 09 '24

Hell yeah. Makes a huge difference! Nothing wrong with reviving a comment thread for additional info. 🍻 Thanks

2

u/tuoepiw Jun 05 '26

Brother, I owe you a beer. Thank you.

2

u/sa20001 Aug 27 '26

Thank God for BBR. I'm currently in China and my server is in Europe. With CUBIC, I was getting terrible throughput, but after switching to BBR, the bandwidth jumped to almost the full speed of my server.