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Package c-states. Disks spun up vs spun down

  • Minor

Hi.
I have a unexpected behaviour, at least to me, to report.
I manage to achieve on powertop cpu package level C10 with disks spun up but only C8 with disks spun down.

I’ve already reported that when running Unraid as a guest in Proxmox, I observed in Proxmox htop that unraid vm CPU utilisation goes up when the disks spin down.

This time, I tested on bare metal and found the same behaviour. Something happens when the disks spin down that triggers higher CPU usage. These tests were done on version 7.0.1. I also tried 7.1.0 beta 1 with the same results — higher CPU usage with the disks spun down.
 

Disks spun up, package at C10:

Disks_spun_up.thumb.jpg.fe6b7b4c11bc5bd842831fad1071a679.jpg 

Disks spun down, package at C8:
Disks_spun_down.thumb.jpg.fedd4109847b7d66f8a589db682c0ac8.jpg

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