Sean Hefty wrote:
OpenMPI uses rdma_bind_addr() to figure out which ip addresses are valid
for which IB devices. This logic is now broken. Regardless of whether
OpenMPI should use another method for determining which IP address
belong to which interfaces, we should probably rethink whether we're
breaking rdma-cm semantics in a bad way on a point release.
The changes to the rdma_cm have been merged upstream. These were fixes
specifically to enable using the loopback address with RDMA devices.
At first thought, we can extend enum ib_device_cap_flags to indicate if a device
supports loopback capabilities or not. The rdma_cm could then skip over such
devices when dealing with a loopback address.
- Sean
But how can you determine _which_ rdma device should be used if and app
binds to 127.0.0.1? I think this is busted...
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