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nope RTT even for these kind of network hardware is >=10 microseconds (I deal with such stuff professionally). Still a big gain going async :-)

Surprising. >10us sounds pretty slow to me.

round trip. one way 5 to 7 micros. some special cards go down to 3 one way, however with rtt, software usually adds some 2 micros overall

Less than 1us, RTT to software (http://exablaze.com/exanic-x4)

Less than 400ns per switch hop (http://www.arista.com/en/products/7150-series) excluding congestion.