[skydhash]

OpenBSD uses a Giant Lock model (simpler code) instead of the fine grained locking mechanism in Linux. And Linux has a some quirks and hacks to improve performance (instead of doing the slow, but correct thing). One example is the USB Gadget thing.

[bw86]

This is not wrong per se, but they also try to reduce/remove this giant lock as much as possible. If you see entries like "Unlocked socket splicing." in the changelog, then this is one more case where the giant lock is not needed and in which therefore all cores can be used.

It just takes time.