Back out r14073 - it speeds up TCP latency / bandwidth but at the same time
it kills ROMIO and one-sided performance when using only TCP. The problem
is that it only allows those two to be progressed every couple of seconds,
leading to what looks like hangs in the one-sided tests (and the ROMIO stuff,
although people seem to not notice that at this point).
This commit was SVN r14144.
The following SVN revision numbers were found above:
r14073 --> open-mpi/ompi@64fbbc20b8
r14142 --> open-mpi/ompi@241545a098
e283e6f9d9