Hi Roland, I can run ibv_devices but ibv_asyncwatch seems to fail: ibv_devices device node GUID ------ ---------------- mthca0 0008f10403960558 ibv_asyncwatch Couldn't get context for mthca0 dmesg shows: Jun 1 19:01:00 hal kernel: UCM: Created struct Jun 1 19:01:00 hal kernel: UCM: Deleted struct Any idea on what is wrong ? Thanks. -- Hal