I am trying to send a cosine signal from a USRP B210 with a carrier of 2.4GHz. I need this signal to be as high in frequency as possible, but if I exceed a sample rate of ~10M I start to get many underflows and the program stops responding when I try to stop the run.
I get the following error:
[WARNING] [MULTI_USRP] The total sum of rates (20.000000 MSps on 1 channels) exceeds the maximum capacity of the connection.
This can cause underruns (U).
UUUUUUUUUUUUUUUUUUUUU
...
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUusrp_sink :error: In the last 750 ms, 1870 underflows occurred.
And here is the system monitor while running the program:
Does anyone know what could be happening?
At first I tried to use 60M, as this is the limit of the USRP. At this point the system monitor showed one core on 100% which I thought it was the problem, ut at ~15M no core its at full capacity and Im still getting underflows.
Also, I ran the benchmark given in https://kb.ettus.com/Verifying_the_Operation_of_the_USRP_Using_UHD_and_GNU_Radio :
[HIPPER@archFH examples]$ ./benchmark_rate --rx_rate 10e6 --tx_rate 10e6
[INFO] [UHD] linux; GNU C++ version 13.2.1 20230801; Boost_108300; UHD_4.5.0.HEAD-0-g471af98f
[00:00:00.000039] Creating the usrp device with: ...
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 2.
[INFO] [B200] Detecting internal GPSDO....
[INFO] [GPS] Found an internal GPSDO: GPSTCXO , Firmware Rev 0.929a
[WARNING] [GPS] update_cache(): Malformed GPSDO string: GPSTCXO , Firmware Rev 0.929a
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Setting master clock rate selection to 'automatic'.
[INFO] [B200] Asking for clock rate 16.000000 MHz...
[INFO] [B200] Actually got clock rate 16.000000 MHz.
Using Device: Single USRP:
Device: B-Series Device
Mboard 0: B210
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: FE-RX2
RX Channel: 1
RX DSP: 1
RX Dboard: A
RX Subdev: FE-RX1
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: FE-TX2
TX Channel: 1
TX DSP: 1
TX Dboard: A
TX Subdev: FE-TX1
[00:00:03.414528827] Setting device timestamp to 0...
[INFO] [B200] Asking for clock rate 40.000000 MHz...
[INFO] [B200] Actually got clock rate 40.000000 MHz.
[00:00:03.850163910] Testing receive rate 10.000000 Msps on 1 channels
Setting TX spp to 2040
[00:00:03.878517475] Testing transmit rate 10.000000 Msps on 1 channels
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Benchmark complete.
Benchmark rate summary:
Num received samples: 32224791
Num dropped samples: 68048147
Num overruns detected: 573
Num transmitted samples: 79670160
Num sequence errors (Tx): 0
Num sequence errors (Rx): 0
Num underruns detected: 16773
Num late commands: 0
Num timeouts (Tx): 0
Num timeouts (Rx): 0
Done!
As the warning says, you're trying to get more samples across your USB port than your USB standard allows you to.
This means that you're using a USB 2 port, or a USB 2-only cable to connect your USRP.
And we see that instantly verified in your output, as well:
So, reading output is crucial!