srsRAN with Open5GS on Raspberrys shows different bitrate on gNB trace and Iperf3 results

[giuliafgomes36]

Issue Description

Hello, everyone. I'm trying to build a network with srsRAN_Project (in a Raspberry Pi4) and Open5GS (in a Raspberry Pi5) with ZMQ and srsUE, the document I followed is indicated bellow. The Raspberrys are conected with an Ethernet cable, but the problem is that although my network is running, when I test UE and CORE communication with Iperf3 the gNB trace shows a bitrate of 74Mbps for UL while Iperf3 shows a bitrate of 4Mbps. I know that Iperf3 only measures the payload of the test but the difference is too big, so I came to see if someone could help me.

Document: https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html#zeromq-based-setup

Setup Details

srsRAN (Raspberry Pi 4)
Open5GS (Raspberry Pi 5)
ZMQ
srsUE

Expected Behavior

That gNB trace and Iperf3 results have simmilar values for bitrate.

Actual Behaviour

gNB trace shows 74Mbps of bitrate while Iperf3 shows 4Mbps.

Steps to reproduce the problem

gNB config

cu_cp:
  amf:
    addr: 10.0.0.1 #IP AMF (Pi5)
    port: 38412
    bind_addr: 10.0.0.2 #IP gNB (Pi4)
    supported_tracking_areas:
      - tac: 7
        plmn_list:
          - plmn: "00101"
            tai_slice_support_list:
              - sst: 1
  inactivity_timer: 7200

ru_sdr:
  device_driver: zmq
  device_args: tx_port=tcp://127.0.0.1:2000,rx_port=tcp://127.0.0.1:2001,base_srate=23.04e6
  srate: 23.04
  tx_gain: 75
  rx_gain: 75
[...]

srsUE config

[rf]
freq_offset = 0
tx_gain = 75
rx_gain = 75
srate = 23.04e6
nof_antennas = 1

device_name = zmq
device_args = tx_port=tcp://127.0.0.1:2001,rx_port=tcp://127.0.0.1:2000,base_srate=23.04e6

[rat.eutra]
dl_earfcn = 2850
nof_carriers = 0

[rat.nr]
bands = 3
nof_carriers = 1
max_nof_prb = 106
nof_prb = 106

[pcap]
enable = none
mac_filename = /tmp/ue_mac.pcap
mac_nr_filename = /tmp/ue_mac_nr.pcap
nas_filename = /tmp/ue_nas.pcap

[log]
all_level = info
phy_lib_level = none
all_hex_limit = 32
filename = /tmp/ue.log
file_max_size = -1

[usim]
mode = soft
algo = milenage
opc  = 63BFA50EE6523365FF14C1F45F88737D
k    = 00112233445566778899aabbccddeeff
imsi = 001010123456780
imei = 353490069873319

[rrc]
release = 15
ue_category = 4

[nas]
apn = srsapn
apn_protocol = ipv4

[gw]
netns = ue1
ip_devname = tun_srsue
ip_netmask = 255.255.255.0

[gui]
enable = false

Ip route config on Rasp Pi5

Iperf3 tests on Pi4
sudo ip netns exec ue1 iperf3 -c 10.45.0.1 -i 1 -t 60
sudo ip netns exec ue1 iperf3 -c 10.45.0.1 -i 1 -t 60 -u -b 5M
sudo ip netns exec ue1 iperf3 -c 10.45.0.1 -i 1 -t 60 --sctp

Additional Information

gNB trace

srsUE trace

iperf3 result

[pgawlowicz]

Hi @giuliafgomes36 could you try with the newest code version?