If you don't have any limitations on what which driver you can use - try to install latest MLNX OFED (see link below). There have been number of significant improvements between 1.5,x and 2.x OFED versions specifically for IPoIB. Note that for ConnectX family adapters the default IPoIB operating mode is UD with 2.x drivers and it was CM with 1.5.x driver versions. With 2.x drivers UD is the recommended mode, so unless there are any other reasons to use CM in your setup – leave default UD.
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