Super dangerous to benchmark lock performance using microbenchmarks. If you have a tiny benchmark, then you're putting the CPU and memory into a very specific and unusual state (everything is quiet other than the lock itself).

The real world story for locks is usually that you're not rage-contending 100% of the time, but that you have some contention combined with CPUs doing some real work and some real memory accesses.

What I've found is that in those more real scenarios, the locks that perform best in microbenchmarks fall apart compared to completely different and unexpected algorithms.