[SOLVED] Windows 11 - Huge CPU usage

[PinkFloydFr]

Hi,

Installed successfully Windows 11 official iso under proxmox but i am facing huge CPU usage.

Proxmox machine all full update at 23/01/2025

• Here is the proxmox/harware infos :

• VM Configuration ( all drive on physical SSD as proxmox )

agent: 1
balloon: 0
bios: ovmf
boot:
cores: 8
cpu: host
efidisk0: qcow2:100/vm-100-disk-0.qcow2,efitype=4m,pre-enrolled-keys=1,size=528K
machine: pc-q35-9.0
memory: 8192
meta: creation-qemu=9.0.2,ctime=1737208458
name: ProxWin
net0: virtio=BC:24:11:60:87:90,bridge=vmbr0,firewall=1
numa: 1
ostype: win11
scsi0: qcow2:100/vm-100-disk-2.qcow2,cache=writeback,discard=on,iothread=1,size=150G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=d6c8b790-afcb-4667-9b7b-353f791dd9ce
sockets: 2
tpmstate0: local-lvm:vm-100-disk-0,size=4M,version=v2.0
vmgenid: 514120c7-0b65-4b88-aeff-18fdfaf09bc1

• Already Tested :

With/Without numa ( and 1 or 2 socket )
Balloon On / Off

• pve-qemu-kvm:

Installed: 9.0.2-4
Candidate: 9.0.2-4

qemu-w64-setup-20241220.exe installed, no missing device drivers.

• Global perf ( the VM is doing nothin, just started ) :

Sometimes in the task manager i can see ( note sur the cause, but i give it at information ) :



All core in windows are working between 20 - 40 %

Proxmox :


In conclusion Windows is working but so slow....

Glad if someone can help ! Have a nice day !

 

[l.leahu-vladucu]

Hello PinkFloydFr! First of all, maybe you are already aware of this, but there is a page for Windows 11 guest best practices. I recommend following the recommendations there, if not done already. Also make sure to install both the QEMU Guest Agent and the drivers.

Also, can you please post the output of the following command: pveversion -v

 

[gfngfn256]

I would not complain - you are running a modern-day Windows 11 OS on an antiquated 12 year-old, sluggish 2ghz CPU that has already been EOL for 5 years - see here. Maybe install it bare-metal on that server & see how it performs!

You could maybe try changing that CPU type from host to something else, maybe start with the x86-64-v4 etc. Some occasionally have reported better performance.

However be aware that changing that CPU type may affect Windows licensing/authentication etc.

 

[PinkFloydFr]

This is a POC/TEST before validating my migration process...

Thanks for give me the way of cpu emulation, first, test WestMere and oh miracle, windows running smoothly, then tested IvyBridge.

I will stay with IvyBridge, ( 2 socket / 8 cores / numa on ) as this seem the most optimized for my currents Xeons.

 

[gfngfn256]

Thanks for give me the way of cpu emulation

You are welcome.

validating my migration process...

Be aware: that to migrate the VM between nodes on a cluster, you'd probably anyway not want to choose host as CPU type, since if the nodes use different CPU physically, the migration will probably fail.

Maybe mark this thread as Solved. At the top of the thread, choose the Edit thread button, then from the (no prefix) dropdown choose Solved.

 

[PinkFloydFr]

Be aware: that to migrate the VM between nodes on a cluster, you'd probably anyway not want to choose host as CPU type, since if the nodes use different CPU physically, the migration will probably fail.

Yes agreed.