High CPU load for Windows 10 Guests when idle

Perhaps a silly question, but would it be advisable to simply disable HPET in the BIOS of the host until this is fixed?

 

Update - out of curiosity it looks like you can't disable HPET on modern HP business grade hardware, so there's that. Will the workarounds in this thread potentially interfere with fixes in the future? Also, has anyone tried Windows 10 1809 yet?

 

On a HP DL120G7 E3-1220 running proxmox 5.2-9, my idling 2 core windows 10 Pro 1803 VM gets :
- ~15% cpu usage with OS type Windows 10/2016
- ~3% cpu usage with OS type Other
- ~1-1.5% cpu usage with OS type Windows 10/2016 and no-hpet commented out (post #9)
- ~0.8-1% cpu usage with OS type Windows 10/2016 and hv_synic and hv_stimer flags (post #11)

No drawback as far as I can tell.

Is there any reason why proxmox has not yet implemented the patch from post #11 ?

 

@pfoo

It is implemented and would active when the qemu 3 update package goes live on the repository.

 

This worked for me too! Win10 VM on idle was averaging 14% CPU, dropped down to 2%. Thanks!