Difference between proxmox VM CPU load and HA

Installation
1

I noticed a difference between what proxmox is reporting CPU wise and HA itself.
At the moment HA is reporting 9-10% and proxmox 30-32% on the vm.

Proxmox 8.4.19 running an VM with HOAS 18.0 wit Core at 2026.5.1
The VM has "Use tablet for pointer" set at "No" (i checked that when i read some problems with that)
VM has 4GB of memory and 2 cores assigned and 2 USB devices passed through.

  • Sonoff Zigbee Dongle
  • DSMR Smart Meter serial device

Anyone know how i can check what is causing the difference?

Edit: I am using the " Use USB Port" option to pass through in proxmox

2

My guess is you are only seeing the core container utilisation in your sensor.

Do you have manny app (add-on) containers?

They would not be included in your sensor.

e.g. your sensor only shows this

image
image1301×1827 313 KB

Where as Proxmox shows the top graph.

3

Also the VM will only see the tics it has available, so tics used for Proxmox and virtualization of the VM will not be present inside the VM.

Many modern BIOSes have settings for virtualization and these should be enabled. They enable direct access to some resources that takes a lot of power to emulate otherwise.