[j-nsp] vMX questions - vCPU math

[Robert Hass]

Hi
I have few questions regarding vMX deployed on platform:
- KVM+Ubuntu as Host/Hypervisor
- server with 2 CPUs, 8 core each, HT enabled
- DualPort (2x10G) Intel X520 NIC (SR-IOV mode)
- DualPort Intel i350 NIC
- vMX performance-mode (SR-IOV only)
- 64GB RAM (4GB Ubuntu, 8GB vCP, 52GB vFPC)
- JunOS 18.2R1-S1.5 (but I can upgrade to 18.3 or even 18.4)

1) vMX is using CPU-pinning technique. Can vMX use two CPUs for vFPC ?
   Eg. machine with two CPUs, 6 cores each. Total 12 cores. Will vMX
   use secondary CPU for packet processing ?

2) Performance mode for VFP requires cores=(4*number-of-ports)+3.
   So in my case (2x10GE SR-IOV) it's (4*2)+3=11. Will vMX count the
   cores resulting from HT (not physical) in that case?

3) How JunOS Upgrade process looks like on vMX ? Is it regular
   request system software add ...

Rob