The thread is large, maybe I read the whole thing at one time, but the point of it is literally someone asking why using direct io is slower. That is the point I make, you can't just enable direct io (which by passes all the logic to speed up reads and writes) and expect increased performance without a lot of extra up front work.

But back to my first question, I am still curious what your workload is that you feel will benefit from direct io :)