On 01/13/2020 05:26 AM, Amrit Pal Singh via USRP-users wrote:
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
The AD9361 RF Front end used on the B2xx series isn't well-optimized for
frequency hopping. The driver code does it's best to reduce
tuning times as much as it can, but this is a hardware limitation of
the RF chip used on the B2xx series.
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