I think it varies. FreeBSD does have a lot of stuff, like netmap, capsicum, that is quite experimental in some sense, although capsicum is a great design. NetBS

I think it varies. FreeBSD does have a lot of stuff, like netmap, capsicum, that is quite experimental in some sense, although capsicum is a great design. NetBSD has rump kernel, but thats not much code, it is just(!) portability done right, some build fixes and a little code.