I wrote: 

> But it works OK with libfabric (ofi mtl).  Is there a problem with
> libfabric?

Apparently there is, or at least with ompi 1.10.  I've now realized IMB
pingpong latency on a QDR IB system with ompi 1.10.6+libfabric is
~2.5μs, which it isn't with ompi 1.6 openib.
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