Hi Mellanox/ Accelio, There is a very old commit in perftest 96050b8b that assumes bit 23 in device cap flags means there is driver support for contiguous buffer allocation of user data There is a clash with the following device capability defined in libibverbs/verbs.h: #define IBV_DEVICE_MEM_WINDOW_TYPE_2A = 1 << 23 Once driver advertises memory window type 2a capability, the perftest application fails. I found that IB_DEVICE_MR_ALLOCATE is defined as bit 23 for freebsd git hub and accelio github And then I saw there are a lot of clashes between ib_verbs + upstream kernel Clash between the two needs to be resolved. Perftest wise: Perhaps an additional parameter to perftest ? Please advise, Thanks, Michal -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html