[cperciva]

Confusingly, on FreeBSD this option is SO_REUSEPORT_LB; SO_REUSEPORT is something different.

I think the confusing thing was that Linux added an option and named it "SO_REUSEPORT" even though that name had meant something completely different for decades.

[qhwudbebd]

Don't disagree for what it's worth. The non-_RB behaviour for streams is useful too and isn't available at all on Linux. Though it's nowhere near as annoying as Linux having the epoll() mess instead of kqueue().