understanding CPU utilization in unraid (VM)

[kirkyg]

I noticed that my proxmox instance had some small cpu load and I had disconnected from my windows 10 vm which was doing nothing at the time.  The only other thing running was my unraid VM so i was looking in to it to see how much cpu utilization there was.

 

I currently have an lsi hba card passed through that is running preclear on one 14TB drive. I logged into the VM and see 2 cores I have allocated showing one at 100% pegged and the other moving between about 40-90%.  When I run htop command in the terminal, as you can see below, there are only 2-3 processes above 0% and the preclear activity is top one with only 5-7% cpu utilization.  Is this a reporting issue in the VM where its looking at the entire cpu capacity and reporting against all cores even though only 2 should be allocated as available resources?  I also would not expect a preclear operation to max out two cores of a zen 3 5800x - any ideas?

 

 

 

Edited January 30, 2023 by kirkyg

[JonathanM]

Dashboard includes cpu time spent waiting for i/o, and since preclear is waiting for the disk i/o 100% of the time it's running...