>>>>> "yhlu" == yhlu <yhlu.kernel at gmail.com> writes: yhlu> YES. I will send you the output message later about yhlu> "CONFIG_INFINIBAND_MTHCA_DEBUG=y" Thanks. In the meantime, can you explain what it means to "enable the prefmem64 to use real 64 range"? What is the difference between this and the configuration that works? - R.