Evaluation of X310 Performance on Two Different Computers

[Erick5G]

We are assessing the performance of an X310 radio in a SISO system operating with a 20 MHz bandwidth in the N3 band. The evaluation is conducted using two different computers with the following specifications:

PC 1: Intel i9-10900, 2.8 GHz (20 cores), 32 GB RAM, 1.8 TB SSD, Intel UHD Graphics 630, NVIDIA Quadro P400.

PC 2: Intel i7-10700, 2.9 GHz (16 cores), 16 GB RAM, 256 GB SSD, Intel UHD Graphics 630.

Our observations indicate a noticeable difference in bitrate performance between PC 1 and PC 2, with PC 1 achieving nearly 95 Mbps in the downlink (DL) channel.

What factors could be contributing to this discrepancy in bitrate performance?

[pgawlowicz]

Hi,
Do you have one x310 USRP, that you connect to two different PCs? Did the RF environment change between the two tests? It seems that SNR is slightly different in both cases.
Piotr

[Erick5G]

Hi @pgawlowicz
We kept the same RF enviroment for both PC's, just changing PCs.

Attached config .yml
cu_cp:
amf:
addr: 10.53.1.1
port: 38412
bind_addr: 10.53.1.5
supported_tracking_areas:
- tac: 1
plmn_list:
- plmn: "99970"
tai_slice_support_list:
- sst: 1

ru_sdr:
device_driver: uhd
device_args: type=x300,addr=192.168.40.2
clock: internal #gpsdo
sync: internal #gpsdo
srate: 23.04 # RF sample rate might need to be adjusted according to selected bandwidth.
tx_gain: 7 #25 # Transmit gain of the RF might need to adjusted to the given situation.
rx_gain: 7 #20
time_alignment_calibration: 54

cell_cfg:
nof_antennas_ul: 1
nof_antennas_dl: 1
dl_arfcn: 368500 #368640
band: 3
channel_bandwidth_MHz: 20
common_scs: 15
plmn: "99970"
tac: 1
pci: 1

log:
filename: /tmp/gnb.log
all_level: info

pcap:
mac_enable: false
mac_filename: /tmp/gnb_mac.pcap
ngap_enable: false
ngap_filename: /tmp/gnb_ngap.pcap

[pgawlowicz]

Did you run the srsran_performance on both PCs?

[Erick5G]

Yes, we did.
We repeated the test and got the same results.

[Erick5G]

Similarly, we change the radio for an n310, same RF environment and we obtain very similar results.

[pgawlowicz]

Hi @Erick5G could you post gnb logs from both PCs?

[Erick5G]

Hi @pgawlowicz
Sure, attached link for logs: https://drive.google.com/drive/folders/18mdjl84Jc9hZaG49MqVf33fPiPwQvLqq?usp=sharing