Have a source for this now: from the mechanical sympathy blog, 1µs for InfiniBand and 5µs for Mellanox/Solarflare user-space IP with RDMA 10GigE.
http://mechanical-sympathy.blogspot.com/2011/11/locks-condition-variables-latency.html My current standing is that IB is always a fraction faster than Ethernet but only by 1-2 generations and requires a complete new expensive infrastructure replacement on each IB multiplier boost. Ethernet definitely seems the way forward but isn't the top position. -- Steve-o
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