Help With Stuttery Games in VM

H

huggy3233

New Member
May 29, 2023
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On my proxmox server (R7 5700X, 48GB RAM, Proxmox 7.4, Kernel: 6.2.11-2-pve) I have a vm running Arch Linux for gaming with a RX 6700 XT passed through to it. In most games I see performance within margin of error of running bare metal, but some games, most notably Sea of Thieves and Forza Horizon 5 experience insane stuttering, despite reporting frame rates very close to what I get running them on a bare metal linux machine.
I've tried:
  • Pinning cpu cores using taskset (I haven't worked out how to reserve them so other processes can use them).
  • Changing cpu type to host
  • Enabling hugepages
  • Turning off all other vms and containers
None of these fixes have solved the problem, does anybody know how I could fix this?
 
Are you maybe assigning too many vCPUs to your gaming VM so PVE host itself got no ressources left to hypervise the guests? You only got 8 CPU cores, so I personally wouldn't add more than 6 vCPUs to a single VM.
 
I currently have it set to 12 cpu cores which I assumed meant 6 hyper-threaded cores, I'll try set it to 6 and see what happens. Also whats the different between cpu cores and vCPUs?
 
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