It is something that could be helpful to have at the back of your mind if you're tasked with optimizing postgres and OS settings for big workloads.

But it's one of a myriad of little things, not something that could inform a platform decision. It's much more interesting for kernel devs than it is for postgresql users.

I think what this shows is that issues related to interactions between RAM, caches and CPU cores are becoming a lot more complex on all platforms.