Recent kernels, e.g. 2.6.32-279.9.1.el6.x86_64 come with new version of mlx4_en Mellanox ConnectX HCA Ethernet driver: 2.0 versus 1.5.4.1 in older kernels like 2.6.32-220.el6.x86_64. The new driver fails to recognize/activate Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / 10GigE] (rev b0) card in 10GbE mode. The basic driver (mlx4_core) seems to work in both kernels.
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