hi, On Sat, Jan 28, 2017 at 6:42 PM, Maxime Villard <[email protected]> wrote:
> I've updated my patch. The previous one was completely wrong. However, I'm > not > going to commit it now. > > For the record: in fact, I cannot measure the performance because of two > issues > - our PMCs do not support SMP, which is problematic since false-sharing > occurs > with at least two CPUs. I can't get the interesting measurement MSRs on > my > AMD. > tprof used to work fine on smp when i was using it actively. no idea about your cpu model though. > - time-based benchmarking does not work either for me; when performing > 5x10^8 > calls to pmap_page_zero on two CPUs, several driver errors get printed > on > the screen midway and the system freezes. It seems to be related to my > hardware, because I've already seen this kind of things in the past on > that > particular machine, regardless of the OS running on it. > > Maxime >
