The Failed to insert module ‘nvidia_peermem’: Invalid agrument is not specific to DGX Spark. I get those log entries on a Dell (not Spark) system with RTX A4000:
Nov 23 12:02:08 texas systemd-modules-load[463]: Failed to insert module 'nvidia_peermem': Invalid argument
Nov 23 12:02:09 texas systemd-modules-load[1008]: Failed to insert module 'nvidia_peermem': Invalid argument
Nov 23 12:02:10 texas systemd-modules-load[1041]: Failed to insert module 'nvidia_peermem': Invalid argument
Some info why at DGX Spark GPUDirect RDMA