Hi, I'm using two USRP2 with XCVR2450s, gnuradio 3.2.2 and Ubuntu 9.10.
I ran the benchmark_tx/rx example from gnuradio-examples/ofdm and measured packet inter-arrival times at the receiver. I also modified the sender to wait for some time (like 200ms) between individual packets. I also set the msg queue size to one. In python code I'm printing a bunch of time.time() values to keep the timeline of the events. What I observe is the following: - inter-departure times are constant, the packet size and the bit rate would of course influence the time spent sending, but that would still be a relatively small value. - at the receiver, most packets are received with the inter-arrival time comparable to the inter-departure time at the sender, however, occasionally I would see a huge lag between two consecutive packets (almost a second). I read the NSDI'09 paper (http://portal.acm.org/citation.cfm?id=1558984) that talks about USRP1 performance, however, what I observe is way higher delay and it's USRP2. Thus, I'm sure that there's something I can do to fix this delay. Any hints? Cheers, Veljko _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
