PCIe passthrough

[leesteken]

Your cmdline looks strange: it does not match a usual Proxmox host (no amd_iommu=on and no initrd=) and it implies LVM instead of ZFS. Please run cat /proc/cmdline on the Proxmox host.
Memory could be an issue if ZFS uses 50% and the other VM uses 25% (because all memory must be pinned) then allocating 25% could be a problem (in ZFS does not release memory quickly enough). This is easily tested by temporarily reducing the memory amount (a lot), and I would expect memory allocation errors in the logs.
Note that KSM won't apply to VMs that use PCI passthrough (because of Direct Memory Access as I said before).

EDIT: Timeouts during starting of VMs used to be a sign to taking to long to allocate and map large amounts of pages into actual memory, but I thought that was fixed long ago.

 

[showiproute]

This is my whole cmdline:

root@proxmox1:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.4.114-1-pve root=/dev/mapper/pve-root ro quiet

Nothing more


Regarding IOMMU: It was strange to me in the beginning as well but I was able to configure IOMMU/SR-IOV directly from BIOS and the IOMMU groups are being displayed at Proxmox.

I am able to passthrough PCIe devices to other VMs so I guess this is working?!