Hello everyone,My Windows virtual machine isn't running smoothly, and I'd appreciate your help troubleshooting. Thank you in advance. (Note: My English isn't very strong; this post has been translated.)
args: -cpu 'host,-hypervisor,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,kvm=off,hv_vendor_id=amd', -smbios type=0,vendor="American Megatrends International LLC",version="1.02",date="06/06/2025"
bios: ovmf
boot: order=hostpci0
cores: 12
cpu: host,hidden=1
efidisk0: local:101/vm-101-disk-0.qcow2,efitype=4m,pre-enrolled-keys=1,size=528K
hostpci0: 0000:03:00.0
hostpci1: 0000:01:00.0,pcie=1,x-vga=1
hostpci2: 0000:01:00.1
ide2: local:iso/virtio-win-0.1.266.iso,media=cdrom,size=707456K
machine: pc-q35-10.1
memory: 50000
meta: creation-qemu=10.0.2,ctime=1757311421
name: win
net0: virtio=BC:24:11:4B:36:F4,bridge=vmbr0,firewall=1
numa: 0
ostype: win11
smbios1: uuid=180f6257-cbfd-48c3-bfdd-080b5753a3d6
sockets: 1
tags: 192.168.31.33
tpmstate0: local:101/vm-101-disk-1.raw,size=4M,version=v2.0
usb0: host=0a12:0001
usb1: host=046d:c332
usb2: host=413c:2105
vga: none
vmgenid: bfb961e0-be15-4f8b-8293-5b141d5a8d6b
Any insights or suggestions would be greatly appreciated. Thank you!
1. Hardware Overview
- Device: Minisforum N5
- CPU: AMD Ryzen 7 255
- RAM: DDR5 64GB
- Storage: Three independent system drives:
- One with FNOS installed
- One with Windows installed
- One with Proxmox VE (PVE) installed
- Each drive can boot and run independently.
- External GPU: RTX 4070 Ti Super, connected via Thunderbolt interface.
2. System Configuration
I typically use PVE 9.1.1 as the primary system. Two VMs are set up, each with direct passthrough to the physical drives where Windows and FNOS are installed.3. Performance Issue
- When I boot directly from the Windows drive, the 3DMark Time Spy score reaches ~20,000, indicating a GPU performance loss of about 15% (compared to ideal conditions).
- When I run the Windows VM under PVE with the Thunderbolt GPU passthrough, the 3DMark Time Spy score drops to ~10,000, with a GPU performance loss of nearly 50%.
args: -cpu 'host,-hypervisor,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,kvm=off,hv_vendor_id=amd', -smbios type=0,vendor="American Megatrends International LLC",version="1.02",date="06/06/2025"
bios: ovmf
boot: order=hostpci0
cores: 12
cpu: host,hidden=1
efidisk0: local:101/vm-101-disk-0.qcow2,efitype=4m,pre-enrolled-keys=1,size=528K
hostpci0: 0000:03:00.0
hostpci1: 0000:01:00.0,pcie=1,x-vga=1
hostpci2: 0000:01:00.1
ide2: local:iso/virtio-win-0.1.266.iso,media=cdrom,size=707456K
machine: pc-q35-10.1
memory: 50000
meta: creation-qemu=10.0.2,ctime=1757311421
name: win
net0: virtio=BC:24:11:4B:36:F4,bridge=vmbr0,firewall=1
numa: 0
ostype: win11
smbios1: uuid=180f6257-cbfd-48c3-bfdd-080b5753a3d6
sockets: 1
tags: 192.168.31.33
tpmstate0: local:101/vm-101-disk-1.raw,size=4M,version=v2.0
usb0: host=0a12:0001
usb1: host=046d:c332
usb2: host=413c:2105
vga: none
vmgenid: bfb961e0-be15-4f8b-8293-5b141d5a8d6b
Any insights or suggestions would be greatly appreciated. Thank you!
Last edited: