As I read this I thought "interesting. I would have thought probing would be better on modern computers with memory pre-fetching"... Then I come to the comments and find out im not the only one thinking that.
You're right, benchmarks have shown that probing is better until you reach ~90% capacity. Cuckoo hashing sufferers from terrible memory locality, and you can only make up for it when a probing table would have worse locality.