I recently installed an Intel Arc A380 into my Proxmox 8.2.2 node to perform transcoding tasks on a VM running Ubuntu 24.04 LTS with PCI passthrough verified as working.
Previously the VM used between between 6-12GB of RAM but the mere act of adding the PCI device shows it's now using ~93% of available RAM. I have tested increasing the VM to 24, 32 and 64GB of RAM and regardless Proxmox reports the VM is using ~93% of it's available RAM. If I remove the PCI devices but leave all other settings the same, the memory usage drops down to the previously acceptable range. Is this normal behavior or am I missing something?
Previously the VM used between between 6-12GB of RAM but the mere act of adding the PCI device shows it's now using ~93% of available RAM. I have tested increasing the VM to 24, 32 and 64GB of RAM and regardless Proxmox reports the VM is using ~93% of it's available RAM. If I remove the PCI devices but leave all other settings the same, the memory usage drops down to the previously acceptable range. Is this normal behavior or am I missing something?
Code:
agent: enabled=1
balloon: 0
boot: c
bootdisk: scsi0
ciuser: ubuntu
cores: 4
hostpci0: 0000:09:00,pcie=1
hostpci1: 0000:0a:00,pcie=1
ide2: local-lvm:vm-235-cloudinit,media=cdrom,size=4M
ipconfig0: ip=##.##.##.##/24,gw=##.##.##.##
machine: q35
memory: 1638
name: rke2-agent-02
net0: virtio=D2:89:16:D4:38:57,bridge=vmbr0
numa: 0
ostype: l26
scsi0: local-lvm:vm-235-disk-0,discard=on,size=20992M,ssd=1
scsi1: local-lvm:vm-235-disk-1,discard=on,size=2G,ssd=1
scsihw: virtio-scsi-pci
serial0: socket
sockets: 1
vga: serial0
