2) Some of my users do want to boot under VM and in LPAR to compare performance.
It's your party so you can do what you feel right. If I were to do serious comparison between Linux in LPAR and in a virtual machine, I would at least use the things we have to exploit z/VM function. Shared kernel and diagnose driver are the first that I can think of.
Clearly we have seen the improvement on z/VM with the on-demand timer, that was the whole purpose. And we even identified a few more related issues. My understanding was that initially the on-demand timer was a disadvantage in a very high utilisation LPAR, but that the current implementation got rid of that. I was wondering whether you had seen any numbers that show the opposite, and I believe you answered that question as well.
Rob
