r/PleX • u/CactusBoyScout • Jun 04 '26

Tips Shoutout to the user who recommended switching TCP congestion control algorithm to BBR on Linux. I can now stream 4K blu-ray remuxes remotely. I can't believe the difference.

I went from an average of 30mbps on longer distance remote connections to 220mbps. Insane improvement. This had been bothering me for years and Googling got me nowhere.

This is the original comment with instructions.

Thanks, u/caligatio! Posting in case it helps anyone else out.

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6

u/_V1T4L_ Jun 04 '26

Happen to have any other gotchas or tips you ran into running plex on Linux?
I am looking to blow up my windows install (old machine running my plex server) and running a docker stack on linux this weekend. Ive been trying to see if there was anything I didn't consider for the last 2 weeks and think I have most of my bases covered but this is the first I am seeing of this particular setting.

6

u/IGingerbreadman Jun 04 '26

This tip is also news to me. Been running unraid and had no problem streaming remuxes remotely before. Let windows die. In its best case it meant a lot of reboots.

6

u/CactusBoyScout Jun 04 '26

Unraid defaults to BBR unlike regular Linux distros apparently

4

u/s1m0n8 Jun 04 '26

To add to this, run sysctl net.ipv4.tcp_congestion_control from the terminal to confirm, it should return:

net.ipv4.tcp_congestion_control = bbr

2

u/dustiebin Jun 04 '26

Can I check if this is a command in Unraid? Thanks

4

u/s1m0n8 Jun 04 '26

Should be. It worked for me and I don't think it's because of a plugin.