Changing the CPU type from KVM64 to [host] slows down the VM

[jsengupta]

I want to change the CPU type of the VM from kvm64 (Default) to [host]. But after restarting the VM, it is operating slow. Disk IOPS drops.

Do I need to perform any extra tweak?

Please note, the VM is running Windows 2016 with Virtio 0.1.208 (Latest) installed.

 

[Moayad]

Could you please post the output of pveversion -v, I would like try to update the VirtIO to 0.1.215 (the latest stable) version [0]

[0] https://pve.proxmox.com/wiki/Windows_VirtIO_Drivers#Using_the_ISO

 

[jsengupta]

VMs are working fine now even after making the cpu type to [host]. Back at that time we had different issue that we did not take a look at.