Hi everyone!
Thanks to the power of the community, a year ago, I was able to learn, install and use Proxmox with multiple LXCs, VMs and grew my passion for homelab stuff.
*It’s not a big issue but it’s been on my mind for a while; my gaming VM has a not so good gaming performance, like it’s a 4090 so I’m still doing great but given the hardware and the bare metal performance it’s passable at best. *
The part that got me to write this post is that the synthetic benchmarks are fine, within the margin of virtualization loss and that raises more questions, so here are some informations
Hardware
- CPU Ryzen 9 5950X 16 cores 32 threads
- GPU Nvidia RTX 4090 FE
- RAM 128 DDR4 3200 ECC
- SSD Crucial 4TB NVME M.2 (raidz1 just for vms not proxmox)
Software
- Fresh installed for purpose of benchmarks this week
- Latest Windows 11 Update (August 2024)
- Nvidia driver 560.81
- Latest cinebench, 3dmark, Warzone etc…
- Eco mode disabled, Nvidia settings to performance, no KVM hide
Proxmox VM Specs
#<div align='center'>
#
# # Windows VM
#
#IP = DHCP
#<br />
#Gaming VM with GPU passthrough
#
#</div>
bios: ovmf
boot: order=ide2;ide0;scsi0
cores: 24
cpu: host
efidisk0: vms:vm-100-disk-0,efitype=4m,pre-enrolled-keys=1,size=1M
hostpci0: 0000:0f:00,pcie=1,x-vga=1
ide0: none,media=cdrom
ide2: none,media=cdrom
machine: pc-q35-8.1
memory: 65536
meta: creation-qemu=8.1.5,ctime=1713376038
name: windows
net0: virtio=BC:24:11:F5:13:CE,bridge=vmbr0,firewall=1
numa: 0
ostype: win11
scsi0: vms:vm-100-disk-1,backup=0,cache=writeback,discard=on,iothread=1,size=1000G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=bda2f1b4-0ba4-4a02-a8ce-4b4aa1889f1a
sockets: 1
tags: vms
tpmstate0: vms:vm-100-disk-2,size=4M,version=v2.0
usb0: host=5-4.1
usb1: host=5-4.2
usb2: host=5-4.4
usb3: host=045e:0b00
vmgenid: bbfb4beb-93f5-44c0-9da8-5b1d2441ea0c
Expected Performance
In baremetal, for gaming and benchmarks I get optimum GPU utilization, falling 1 to 5 percent within other online benchmark with similar hardware
Current Performance
In benchmarks, like Cinebench, I get good GPU utilization
Same for 3dMark Nomad
But in gaming the GPU doesn’t go beyond 40 to 60 percent depending on the game (older screenshot but the point remains even with current versions)
I found 2/3 other posts that talk about this but the suggestions are often not applicable for my case
https://www.reddit.com/r/VFIO/comments/kelcqs/poor_performance_in_cyberpunk_possibly_bad_cpu/
If someone has any ideas, hints, things to try I’d be happy to experiment as long as needed!