[srsran-users] Late Packets Issue

[Mcdonough, Conor]

Hi all,

Hope you are well. I have been struggling with an issue for quite some time and am lost on next steps to troubleshoot this. I am attaching the enb, rr, and ue config files as well as the enb output. In the enb log I keep seeing the error: Late (detected in asynchronous thread). I thought this could be an issue of lack of machine computational power but I increased the number of CPU cores to 6 and am still seeing the same errors. This is being run on a VM. I also disabled C States in bios and enabled governor. What could be the possible issues?

sdr at sdr-Standard-PC-i440FX-PIIX-1996:~/.config/srsran$ sudo srsenb enb.conf
Active RF plugins: libsrsran_rf_uhd.so libsrsran_rf_zmq.so
Inactive RF plugins:
---  Software Radio Systems LTE eNodeB  ---

Reading configuration file enb.conf...
WARNING: Could not verify cpu0 scaling governor
WARNING: Could not verify cpu1 scaling governor
WARNING: Could not verify cpu2 scaling governor
WARNING: Could not verify cpu3 scaling governor
WARNING: Could not verify cpu4 scaling governor
WARNING: Could not verify cpu5 scaling governor

Built in Release mode using commit ce8a3cae1 on branch master.

Opening 1 channels in RF device=uhd with args=type=b200,serial=3164073,clock=external,sampling_rate=11.52e6,num_recv_frames=512,num_send_frames=512,clock=external
Supported RF device list: UHD zmq file
NG connection successful
[INFO] [UHD] linux; GNU C++ version 9.4.0; Boost_107100; UHD_4.3.0.0-0ubuntu1~focal1
Opening USRP channels=1, args: type=b200,serial=3164073,num_recv_frames=512,num_send_frames=512,master_clock_rate=23.04e6
[INFO] [LOGGING] Fastpath logging disabled at runtime.
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[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] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
==== eNodeB started ===
Type <t> to view trace
Setting frequency: DL=1842.5 Mhz, DL_SSB=1843.25 Mhz (SSB-ARFCN=368650), UL=1747.5 MHz for cc_idx=0 nof_prb=52
[INFO] [UHD RF] Tx while waiting for EOB, timed out... 6.23523 >= 6.23516. Starting new burst...
t
Enter t to stop trace.
RF status: O=0, U=4, L=176
[INFO] [UHD RF] Tx while waiting for EOB, timed out... 17.3159 >= 15.9919. Starting new burst...
RF status: O=1, U=2, L=161
RF status: O=0, U=1, L=15
RF status: O=0, U=3, L=117
RF status: O=1, U=4, L=172
RF status: O=0, U=1, L=118
RF status: O=0, U=2, L=115
RF status: O=0, U=1, L=380
t
Enter t to restart trace.
^CStopping ..
Saving MAC PCAP (DLT=149) to /tmp/enb_mac.pcap
---  exiting  ---

Thank you for your help.

Best,

Conor

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