Last follow-up: I just saw that there are some additional messages (errors?) on the serial console when changing the device from IB to Ethernet, maybe they mean something to someone: root_at_one:~ # sysctl sys.device.mlx4_core0.mlx4_port1=eth sys.device.mlx4_core0.mlx4_port1: auto (ib)<7>ib0: stopping interface <7>ib0: downing ib_dev <7>ib0: stopping multicast thread <7>ib0: flushing multicast list <7>"qpn 0x48: invalid attribute mask specified " "for transition 0 to 6. qp_type 4," " attr_mask 0x1\n"<4>ib0: Failed to modify QP to ERROR state <7>ib0: All sends and receives done. <7>ib0: cleaning up ib_dev <7>ib0: stopping multicast thread <7>ib0: flushing multicast list <7>ib0: Cleanup ipoib connected mode. <7>ib1: stopping interface <7>ib1: downing ib_dev <7>ib1: stopping multicast thread <7>ib1: flushing multicast list <7>"qpn 0x49: invalid attribute mask specified " "for transition 0 to 6. qp_type 4," " attr_mask 0x1\n"<4>ib1: Failed to modify QP to ERROR state <7>ib1: All sends and receives done. <7>ib1: cleaning up ib_dev <7>ib1: stopping multicast thread <7>ib1: flushing multicast list <7>ib1: Cleanup ipoib connected mode. <6>mlx4_en mlx4_core0: Using 5 tx rings for port:1 <6>mlx4_en mlx4_core0: Defaulting to 4 rx rings for port:1 <6>mlx4_en mlx4_core0: Activating port:1 mlxen0: Ethernet address: f4:52:14:10:d1:21 <4>mlx4_en: mlx4_core0: Port 1: Using 5 TX rings <4>mlx4_en: mlx4_core0: Port 1: Using 4 RX rings <6>mlx4_ib: Mellanox ConnectX InfiniBand driver v1.Jan 21 09:21:31 0 (April 4, 2008) one kernel: mlx4_en: mlx4_core0: Port 1: Using 5 TX rings Jan <7>ib4: max_srq_sge=31 21 09:21:31 one <7>ib4: max_cm_mtu = 0x10000, num_frags=16 kernel: mlx4_en:ib4: mlx4_core0: PorAttached to mlx4_0 port 2 t 1: Using 4 RX rings -> eth Lars
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