rdma: Set LOW_LATENCY traffic class for control #702
Merged
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Set a priority traffic class (LOW_LATENCY) for the control queue pair. Providers should silently fall back to TC_UNSPEC in the case that LOW_LATENCY is not available, so there's no fallback in this code. The traffic class interface was added in Libfabric 1.9.0 and configure requires at least Libfabric 1.11.0, so there's no need to add backward compatibility #ifdefs.
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