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

Amrit Pal Singh amritnagi32 at gmail.com
Wed Jan 15 23:04:50 EST 2020


Hi Marcus,

Thanks for the inputs. I'll look into these.

Thanks,
Amrit

On Mon, Jan 13, 2020 at 11:50 PM Marcus D. Leech via USRP-users <
usrp-users at lists.ettus.com> wrote:

> 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.
>
>
>
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>
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