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
Also, see here:
https://wiki.analog.com/resources/tools-software/linux-drivers/iio-transceiver/ad9361?s#fastlock_mode
The UHD drivers don't implement "fast lock mode", but if you only have 8
frequencies to manage, you could do some coding
and make it work. But the fact is that for many/most F-H scenarios,
you need more than that. Which requires a lot of
tricky stuff, using those 8 "fast lock" slots as a cache, and doing
cache management. It may not end up being that much
faster.
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
