> I agree that we should probably not allow 127.0.0.1 binds in > ofed-1.5.1 at all because it regresses OpenMPI. Even with IB systems, > if the bind to 127.0.0.1 succeeds, then OpenMPI assumes 127.0.0.1 is > bound to that rdma interface and advertises this address to its peer > as an address to-which that peer can rdma connect! This will break IB > clusters too, not just T3/iWARP cluster. While I think OpenMPI needs > to skip 127.0.0.1 in its logic, I think we should probably defer > allowing 127.0.0.1 binds until ofed-1.6. > > But Jeff, note that if someone uses the upstream kernel and OpenMPI, > its busted... > > So I recommend: > > 1) Don't allow 127.0.0.1 binds in ofed-1.5.1 > > 2) Fix OpenMPI ASAP to never advertise 127.0.0.1 as a valid rdma-cm > connect address (get it in ofed-1.5.2 or ofed-1.6).
Also, there is a good argument for never allowing 127.0.0.1 for rdma anyway. It implies a _software_ loopback. It should NEVER be bound to a real NIC interface and thus rdma binds shouldn't be allowed to it since there is no software rdma loopback support... Unless someone implements software rdma loobpack... ;) _______________________________________________ ewg mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
