Passed-through GPU stuttering

[leesteken]

But still I have bundled IOMMU groups. Shouldn't these be split with the ACS patch applied?

In priciple yes, but no guarantees that it actually can or will. Is the pcie_acs_override parameter actually in the output of cat /proc/cmdline?

 

[stewart]

In priciple yes, but no guarantees that it actually can or will. Is the pcie_acs_override parameter actually in the output of cat /proc/cmdline?

Looks like it's in there:
BOOT_IMAGE=/boot/vmlinuz-5.15.30-2-pve root=/dev/mapper/pve-root ro intel_iommu=on amd_iommu=on iommu=pt rd.driver.pre=vfio-pci video=efifb:off kvm.ignore_msrs=1 kvm.allow_unsafe_assigned_interrupts=1 pcie_acs_override=downstream,multifunction vfio-pci.ids=10de:1c82,10de:0fb9,10de:0fbc vfio-pci.disable_vga=1 video=simplefb:off nofb nomodeset quiet intel_iommu=on amd_iommu=on modprobe.blacklist=xhci_hcd modprobe.blacklist=nvidia-gpu modprobe.blacklist=nouveau modprobe.blacklist=nvidiafb pcie_acs_override=downstream,multifunction nofb nomodeset video=vesafb:off,efifb:off kvm.ignore_msrs=1 kvm.allow_unsafe_assigned_interrupts=1 vfio-pci.ids=10de:1c82,10de:0fb9,10de:0fbc vfio-pci.disable_vga=1 video=simplefb:off

I've been reading other threads that mention typos in the patch, so I'm currently trying to get my head around that.
https://forum.proxmox.com/threads/m...-missing-acs-capabilities-4-patch-file.41257/

 

[granzort]

i have the same issue, i noticed that when I move the mouse or use the keyboard, it's easy to reproduce.

audio/video become choppy ramdomly, it'll be back to normal in a few seconds, but the audio/video are out of sync (The videois behind the audio).

 

[stewart]

i have the same issue, i noticed that when I move the mouse or use the keyboard, it's easy to reproduce.

audio/video become choppy ramdomly, it'll be back to normal in a few seconds, but the audio/video are out of sync (The videois behind the audio).

This might be different for your case, but in my situation it was down to my ZFS pool. I had slow spinning HDDs which induced the stuttering, making me believe it was due to the passthrough.