I recently found this on Reddit while looking into why jellyfin is effected so much by latency. I found that this worked and thought I would share it because it is generally applicable, takes five minutes to setup, and helps a lot with bandwidth on higher latency connections. I admit I am not sure of the technical stuff behind this, so if anyone would like to chime in that would be much appreciated.
Interesting. I’d be interested in hearing other people’s experience with this. Is this BBR stuff enabled by default on any distros?
For example unraid (does that count as a distro?) has it enabled by default
I don’t know if it is, but it is really as simple as adding to lines to a config file and restarting a service.
Are there any downsides to this? Why isn’t it default if it is so drastically better?
https://en.wikipedia.org/wiki/TCP_congestion_control#TCP_BBR
List some issues, but only earlier version, not BBR3
BBR1:
researchers like Geoff Huston and Hock, Bless and Zitterbart found it unfair to other streams and not scalable.
Hock et al. also found “some severe inherent issues such as increased queuing delays, unfairness, and massive packet loss” in the BBR implementation of Linux 4.9.
Soheil Abbasloo et al. (authors of C2TCP) show that BBRv1 doesn’t perform well in dynamic environments such as cellular networks.
I believe it will result in like 10% additional overhead, which may be bad on metered connections, but I am not aware of any situation that results in decreased performance. I don’t really know much about this so if anyone would like to correct me, please do.
I skimmed through it and have no idea what BBR stands for.
Bottleneck Bandwidth and Round-trip propagation time (BBR)
Thank you! I hate unexplained acronyms
It is explained in the article though…
Ahh yes, the first time it is defined is in the conclusion after being used 25 times previously in the article.
It’s an algorithm for determining how fast to upload packets. This article just talks about how to enable it.
Here’s the Wikipedia section about it: https://en.wikipedia.org/wiki/TCP_congestion_control#TCP_BBR
The gist is that instead of only throttling upload rate based on packet loss, BBR constantly measures roundtrip delay (ping) to determine how much bandwidth is available.
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:
Fewer Letters More Letters IP Internet Protocol Plex Brand of media server package TCP Transmission Control Protocol, most often over IP UDP User Datagram Protocol, for real-time communications
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You didn’t catch BBR bot :-)
