Hi all,I try to use a B210 with a computer that runs Ubuntu 22.04 now. However, at higher sampling rates, above 24MSps with 2TX and 2RX streams, I get a lot of overruns and underruns. I need 30.72MSps eventually and got that working on all other machines. This happens on Ubuntu 22.04 with UHD 4.2 (321295fba49fb66ede365afbd9ef62971cdfbfca).
I have another multiple other computers with exactly the same hardware but Ubuntu 20.04 and UHD 4.1 where this works flawlessly. And it worked flawlessly on the exact machine I'm trying to use now with Ubuntu 20.04/UHD4.1
How would you proceed to investigate this issue? Do you have any clues why this might happen?
Cheers Johannes The working setup with 24MSps: --------------------------------$ ./lib/uhd/examples/benchmark_rate --rx_channels "0,1" --tx_channels "0,1" --rx_rate 24e6 --tx_rate 24e6 --args="name=myusrp"
[INFO] [UHD] linux; GNU C++ version 11.2.0; Boost_107400; UHD_4.2.0.1-0-g321295fb
[00:00:00.000150] Creating the usrp device with: name=myusrp... [INFO] [B200] Detected Device: B210 [INFO] [B200] Operating over USB 3.[INFO] [B200] Detecting internal GPSDO.... [INFO] [GPS] Found an internal GPSDO: GPSTCXO, Firmware Rev 0.929b [WARNING] [GPS] update_cache(): Malformed GPSDO string: GPSTCXO, Firmware Rev 0.929b
[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
[00:00:03.83958484] Setting device timestamp to 0...
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)
[INFO] [B200] Asking for clock rate 24.000000 MHz... [INFO] [B200]
Actually got clock rate 24.000000 MHz.
[00:00:06.112597897] Testing receive rate 24.000000 Msps on 2 channels Setting TX spp to 2040 [00:00:06.134883841] Testing transmit rate 24.000000 Msps on 2 channels [00:00:16.136391242] Benchmark complete. Benchmark rate summary: Num received samples: 478676848 Num dropped samples: 0 Num overruns detected: 0 Num transmitted samples: 468069840 Num sequence errors (Tx): 0 Num sequence errors (Rx): 0 Num underruns detected: 0 Num late commands: 0 Num timeouts (Tx): 0 Num timeouts (Rx): 0 Done! ------------------------------- The failing setup with 25MSps: --------------------------------$ ./lib/uhd/examples/benchmark_rate --rx_channels "0,1" --tx_channels "0,1" --rx_rate 25e6 --tx_rate 25e6 --args="name=myusrp"
[INFO] [UHD] linux; GNU C++ version 11.2.0; Boost_107400; UHD_4.2.0.1-0-g321295fb
[00:00:00.000150] Creating the usrp device with: name=myusrp... [INFO] [B200] Detected Device: B210 [INFO] [B200] Operating over USB 3.[INFO] [B200] Detecting internal GPSDO.... [INFO] [GPS] Found an internal GPSDO: GPSTCXO, Firmware Rev 0.929b
[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
[00:00:03.80780849] Setting device timestamp to 0...
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)
[INFO] [B200] Asking for clock rate 25.000000 MHz... [INFO] [B200]
Actually got clock rate 25.000000 MHz.
[00:00:06.661812186] Testing receive rate 25.000000 Msps on 2 channels Setting TX spp to 2040 [00:00:06.684104161] Testing transmit rate 25.000000 Msps on 2 channels UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU ------------------------------------
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