Performance issues with GPU passthrough

[Chrise92]

Hi everyone,
I was able to set a vm with gpu passthrough and use it for quite a while now. Until now i was also quite happy with the performance. However some games (ori and the will of the whisps, RE Village) the performance drops to 5 fps. Other games run with 120fps without any problems.

My specs:
- CPU: Intel i9 9900k
- GPU: Nvidia rtx 3090 (passed to the vm), Radeon rx 580 (used for another vm)
- 64 gb ddr4 ram
- 1 tb nvme (host os)
- 1 tb ssd (vm)

my conf file:

agent: 1
balloon: 0
bios: ovmf
boot: cdn
bootdisk: scsi0
cores: 16
cpu: host,hidden=1,flags=+pcid
cpuunits: 5000
efidisk0: F1:vm-104-disk-1,size=1M
hookscript: local:snippets/exec-cmds
hostpci0: 01:00,pcie=1,romfile=gpu-rtx3090.rom,x-vga=1
machine: q35
memory: 18000
name: win
net0: e1000=42:95:EA:CF:1B:C0,bridge=vmbr0,firewall=1
numa: 1
ostype: win10
scsi0: F1:vm-104-disk-0,backup=0,discard=on,size=850G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=8155d87f-009a-46f9-9b5d-93a6bb5ee9d4
sockets: 1
usb0: host=1-13.1.1,usb3=1
usb1: host=1-13.1.3,usb3=1
usb2: host=1-13.1.2,usb3=1
usb3: host=1-4,usb3=1
vga: none
vmgenid: xxx76-xxx-xxx

Hope anyone can give me a hint what to check.

 

[dcsapak]

anything interesting in dmesg/syslog on the host while playing those games? maybe some kind of copy protection that triggers some performance regression only in virtualization?

 

[Chrise92]

Thanks for your help,
I‘ve updated windows to 21h1 and now both games work. I will do further test with other games