5 Replies Latest reply on Feb 24, 2017 8:22 AM by se6

    ConnectX-3 10Gb ok but not 40Gb (Ubuntu 16.04)


      Ubuntu server 16.04.02 fresh install on a SuperMicro 7048GR-TR

      ConnectX-3 dual port board.

      It is recognised fine:


      lspci -v | grep -i mellan -A 10
      82:00.0 Network controller: Mellanox Technologies MT27500 Family [ConnectX-3]
      Subsystem: Mellanox Technologies MT27500 Family [ConnectX-3]
      Physical Slot: 21
      Flags: bus master, fast devsel, latency 0, IRQ 35
      Memory at fb100000 (64-bit, non-prefetchable) [size=1M]
      Memory at 387ff2800000 (64-bit, prefetchable) [size=8M]
      Capabilities: <access denied>
      Kernel driver in use: mlx4_core
      Kernel modules: mlx4_core


      When I plug a 10Gb Ethernet connector, I see a kernel message and then a new network device is available. However when a plug a 40Gb connector nothing happens: no kernel message, nor network device. Why?

      Tried in 14.04 with same behaviour.

      Any help greatly appreciated.