Underflow issues when using Rpi 4

[faratell]

Hello.
I have installed the srsRAN project on a Raspberry Pi 4 with a 32GB SD card , 8G RAM and Ubuntu 22 as the operating system. I am using a USRP B210 and a GPS antenna for synchronization.
I have set the CPU governor to "performance," allowing the CPU to operate at the maximum frequency of the Raspberry Pi (1.8 GHz).
I have attached my gNB configuration file:
gnb.txt
When I run the gNB, it shows an underflow error. I have tried it with both bandwidth settings: 20 MHz and 10 MHz.
sudo ./gnb -c gnb1.yml

--== srsRAN gNB (commit ee1d86c) ==--

The PRACH detector will not meet the performance requirements with the configuration {Format B4, ZCZ 0, SCS 30kHz, Rx ports 1}.
Lower PHY in dual executor mode.
Available radio types: uhd.
[INFO] [UHD] linux; GNU C++ version 11.2.0; Boost_107400; UHD_4.1.0.5-3
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Making USRP object with args 'type=b200,num_recv_frames=64,num_send_frames=64'
[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.
[INFO] [MULTI_USRP] Setting master clock rate selection to 'manual'.
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
Cell pci=1, bw=10 MHz, 1T1R, dl_arfcn=632628 (n78), dl_freq=3489.42 MHz, dl_ssb_arfcn=632640, ul_freq=3489.42 MHz

N2: Connection to AMF on 192.168.75.181:38412 completed
==== gNB started ===
Type to view help
Late: 13; Underflow: 69; Overflow: 0;
tLate: 0; Underflow: 108; Overflow: 0;

Late: 21; Underflow: 75; Overflow: 0;
Late: 9; Underflow: 66; Overflow: 0;
Late: 4; Underflow: 129; Overflow: 0;
Late: 13; Underflow: 73; Overflow: 0;

[pgawlowicz]

You can try with BW=5MHz, but I am not sure if it works. We run 5MHz cell with RPi5.
Also see the comment here:
#349 (comment) and #339 (comment)

[faratell]

Thanks for your reply. I also set this config but also have underflow.
cell_cfg:
dl_arfcn: 361000
band: 3
channel_bandwidth_MHz: 5
common_scs: 15
plmn: "00101"
tac: 1
pci: 1

[pgawlowicz]

@faratell any update on this issue?

[faratell]

@faratell any update on this issue?
Hi.
No any update. I am waiting for Rpi5 to be prepared and tested on it.