> Really that's new...because netflix thinks otherwise.
That is true[^1]. Doesn't say much the two TCP stacks in 2022 though.
Netflix has built expertise around FreeBSD for years. Not just TCP stack optimisations. There's deployment, management, maintenance, etc. I don't expect them to jump ship easily, especially if the tool is good for the job - which obviously is.
However, even they reckon that FreeBSD _might_ be faster for _a specific_ workflow. Fifteen years ago there would be no comparison between the two in terms of top speed achieved on same hardware or latency, FreeBSD was far superior.
The trend is what's important here. Netflix choose FreeBSD in 2012, in 2022 it is certain that they would have gone with Linux and by 2032 my guess is that they'll be serving using Linux. I hope I'm wrong, the more the merrier.
[^1]: https://news.ycombinator.com/item?id=28584970