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Netflix is pushing 400Gbit/s of TLS traffic per server with 60% CPU load. WhatsApp was doing millions of concurrent TCP connections per server. FreeBSD's networking has been multi-threaded for a long time now.

As seen most recently here https://news.ycombinator.com/item?id=28584738

Esp thanks to in-kernel TLS, which is fantastic.

It has been multi-threaded since at least the early 2000s and most of the work for handling scaling beyond 32 cores was completed in 2012.

https://www.cl.cam.ac.uk/teaching/1516/ConcDisSys/2015-Concu...

Well, to be honest a whole lot has been done to FreeBSD network stack scalability quite recently (14-CURRENT), eg introduction of epoch(9) and the routing nexthop patches.

It's multithreaded.

I run FRR Routing punching 400gbit+ @ 75% CPU load on FreeBSD 12.

On the same hardware, Debian fell over at 1.8gbit.

How long ago did you compare them?

I have been using FreeBSD for networking for awhile now but not at those levels

6 months.