[USRP-users] Benchmarking set_tx_freq and set_rx_freq on X310, B210 and N200

Amrit Pal Singh amritnagi32 at gmail.com
Mon Jan 13 05:26:04 EST 2020


Hi All,

I am benchmarking the following commands on X310, B210 and N200 on UHD-3.14
version:

   1. usrp->set_tx_freq(tune_req, 0);
   2. usrp->set_rx_freq(tune_req, 0);

I am changing the frequencies inside a for loop for 1000 and 5000 times.
The code snippet is as follows:
    int count = 5000;
    uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
    double start = usrp->get_time_now().get_real_secs();
    for(int a = 0; a < count; a++){
        uhd::tune_request_t tune_req = uhd::tune_request_t(800e6 + (a *
1e6), 0);
        tune_req.dsp_freq_policy = uhd::tune_request_t::POLICY_NONE;
        tune_req.rf_freq_policy = uhd::tune_request_t::POLICY_AUTO;
        //usrp->set_tx_freq(tune_req, 0);
        usrp->set_rx_freq(tune_req, 0);
    }
    std::cout << "time:" << ((usrp->get_time_now().get_real_secs() -
start)/count) * 1000 << "(ms)" << std::endl;

The following table summarizes the result observed with average time for a
single frequency hops and the hop rate as well for both Tx and Rx.

X310 test
No of hops Tx time (average) ms Tx Hops/second Rx time (average) ms Rx
Hops/second
1000 0.0453756 22038.27608 0.0441415 22654.41818
5000 0.051013 19602.84633 0.0457056 21879.15704
B210 test
No of hops Tx time (average) ms Tx Hops/second Rx time (average) ms Rx
Hops/second
1000 3.34055 299.3519031 5.13762 194.6426555
5000 3.35529 298.0368314 4.94233 202.3337171
N200 test
No of hops Tx time (average) ms Tx Hops/second Rx time (average) ms Rx
Hops/second
1000 0.0530515 18849.6084 0.0504478 19822.46996
5000 0.0391015 25574.46645 0.037663 26551.2572
As observed, the rate is really slow for B210. I also tested using another
B210 and it gave similar results.
Could anyone share any insights into these values.

Thanks,
Amrit
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