Robert> 0000:04:00.0: CQ overrun on CQN 00000082 This appears to be an issue with the latest FW (I see it with Tavor FW 3.3.1 but not 3.2.0). I am working with Mellanox on finding out whether it's a FW bug or a problem with mthca. For now you can work around it by changing IPOIB_NUM_WC = 4, to IPOIB_NUM_WC = 1, in ipoib.h. - Roland