set_freq would not be a good measure, since it takes a while to
configure the daughterboard. find() isn't great either, since it
waits 10ms to ensure that it's gathered all responses to it's
broadcast.
set_rx_decim should give a reasonable measurement, as long as you're
not streaming data.
BTW, I also have code which can be run which actually measures the
latency on USRP1, rather than just theoretical calculations that you've
found on the wiki:
https://www.cgran.org/wiki/ArchitectureLatencyMeasurements
It uses pings and some modifications to the Linux kernel to measure
latency from host->kernel->USRP, etc.
- George
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