Hi Tim, What's your reference on disabling EPT? I can find some fairly old stuff on this, but I thought newer processors had improved performance here to lower page fault overheads... so I guess I'm wondering if you've seen a recent evaluation somewhere? Re. NUMA etc, it seems like the most important thing if you're running large memory apps inside your guests is to make sure the guest is pinned (both CPU and NUMA wise) and sees a NUMA topology that matches how it is pinned on the host. I haven't had a chance to try it yet but I thought this was all now possible Juno. Beyond that you probably want the guest kernel to be NUMA sassy as well, so it needs (IIRC) Linux 3.13+ to get the numa_balancing (nee autonuma) goodies. I'm not sure if for such cases you might actually want to disable numa balancing on the host or whether the pinning would effectively remove any overhead there anyway... PS: +1 on the meetup suggestion -- Cheers, ~Blairo