On 2022-07-29 16:08, skyung--- via USRP-users wrote:

Hi,

I am setting up OAI 5G gNB and UE with USRP N310 (connected through 1GbE to a desktop with the following CPU:

- Intel(R) Core(TM) i9-7900X CPU @ 3.30GHz

and when I tried to run the UE with

|sudo ./nr-uesoftmodem --sa --usrp-args "type=n3xx, addr=10.0.0.10" --numerology 1 -r 106 --band 78 -s 516 -C 3619200000 --ue-fo-compensation -E --ue-rxgain 110 -d|

it stopped with ERROR_CODE_OVERFLOW (OVERFLOW).

I tried running a benchmark with uhd (rx/tx_rate 41.667MHz) and found that it was dropping the packets, meaning the CPU clock rate is not enough for handling the transmission.

The output of

|./benchmark_rate --rx_rate 41.667e6 --tx_rate 41.667e6 --args "addr=10.0.0.10” |

is as follows:

||
|[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_4.2.0.0-0ubuntu1~bionic1|
|[00:00:00.000350] Creating the usrp device with: addr=10.0.0.10...|
|[INFO] [MPMD] Initializing 1 device(s) in parallel with args: mgmt_addr=10.0.0.10,type=n3xx,product=n310,serial=3240243,name=ni-n3xx-3240243,fpga=HG,claimed=False,addr=10.0.0.10| |[INFO] [MPM.PeriphManager] init() called with device args `fpga=HG,mgmt_addr=10.0.0.10,name=ni-n3xx-3240243,product=n310,clock_source=internal,time_source=internal'.|
|Using Device: Single USRP:|
|Device: N300-Series Device|
|Mboard 0: n310|
|RX Channel: 0|
|RX DSP: 0|
|RX Dboard: A|
|RX Subdev: Magnesium|
|RX Channel: 1|
|RX DSP: 1|
|RX Dboard: A|
|RX Subdev: Magnesium|
|RX Channel: 2|
|RX DSP: 2|
|RX Dboard: B|
|RX Subdev: Magnesium|
|RX Channel: 3|
|RX DSP: 3|
|RX Dboard: B|
|RX Subdev: Magnesium|
|TX Channel: 0|
|TX DSP: 0|
|TX Dboard: A|
|TX Subdev: Magnesium|
|TX Channel: 1|
|TX DSP: 1|
|TX Dboard: A|
|TX Subdev: Magnesium|
|TX Channel: 2|
|TX DSP: 2|
|TX Dboard: B|
|TX Subdev: Magnesium|
|TX Channel: 3|
|TX DSP: 3|
|TX Dboard: B|
|TX Subdev: Magnesium|
|[00:00:02.218344682] Setting device timestamp to 0...|
|[WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [MULTI_USRP] Could not set RX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [MULTI_USRP] Could not set RX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DDC#1] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [0/DDC#1] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [MULTI_USRP] Could not set RX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DDC#1] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [0/DDC#1] The requested decimation is odd; the user should expect passband CIC rolloff.|
|Select an even decimation to ensure that a halfband filter is enabled.|
|Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.|
|decimation = dsp_rate/samp_rate -> 3|
|[WARNING] [MULTI_USRP] Could not set RX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DUC#0] The requested interpolation is odd; the user should expect passband CIC rolloff.|
|Select an even interpolation to ensure that a halfband filter is enabled.|
|[WARNING] [MULTI_USRP] Could not set TX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DUC#0] The requested interpolation is odd; the user should expect passband CIC rolloff.|
|Select an even interpolation to ensure that a halfband filter is enabled.|
|[WARNING] [MULTI_USRP] Could not set TX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DUC#1] The requested interpolation is odd; the user should expect passband CIC rolloff.|
|Select an even interpolation to ensure that a halfband filter is enabled.|
|[WARNING] [MULTI_USRP] Could not set TX rate to 41.667 MHz. Actual rate is 41.667 MHz| |[WARNING] [0/DUC#1] The requested interpolation is odd; the user should expect passband CIC rolloff.|
|Select an even interpolation to ensure that a halfband filter is enabled.|
|[WARNING] [MULTI_USRP] Could not set TX rate to 41.667 MHz. Actual rate is 41.667 MHz|
|Setting TX spp to 364|
|[00:00:02.222267169] Testing receive rate 41.666667 Msps on 1 channels|
|[00:00:02.224390064] Testing transmit rate 41.666667 Msps on 1 channels|
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|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
|UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU[00:00:12.387201078] Benchmark complete.|
|Benchmark rate summary:|
|Num received samples: 2427436|
|Num dropped samples: 399414926|
|Num overruns detected: 75|
|Num transmitted samples: 295401652|
|Num sequence errors (Tx): 0|
|Num sequence errors (Rx): 0|
|Num underruns detected: 14669|
|Num late commands: 0|
|Num timeouts (Tx): 0|
|Num timeouts (Rx): 0|
|Done!|


Could you help me resolve this problem? the benchmark at lower rate (such as 15.624 MHz) worked fine.


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Well, I'll note that 41.667Msps is NOT a proper fraction of ANY of the 3 supported master-clock rates:

125MHz
153.6MHz
122.88MHz

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