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O-RAN 7.2 doc: describe how to interpret counters

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This commit is contained in:
Robert Schmidt
2024-02-08 10:13:39 +01:00
parent a22335a89f
commit 970e7855c4
1 changed files with 45 additions and 2 deletions
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doc/ORAN_FHI7.2_Tutorial.md
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@@ -624,7 +624,7 @@ sudo /usr/local/bin/dpdk-devbind.py --bind vfio-pci 31:06.1
```
</details>
# Start OAI gNB
# Start and Operation of OAI gNB
```bash
cd ran_build/build
@@ -632,5 +632,48 @@ cd ran_build/build
sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/oran.fh.band78.fr1.273PRB.conf --sa --reorder-thread-disable 1 --thread-pool <list of non isolated cpus>
```
For example if you have two numa nodes (for example 18 CPU per socket) in your system and odd cores are non isolated then you can put the thread-pool on `1,3,5,7,9,11,13,15`. Else if you have 1 numa node either you can use isolated cores or non isolated. Just make sure that isolated cores are not the ones defined earlier.
For example if you have two NUMA nodes in your system (for example 18 CPUs per
socket) and odd cores are non-isolated, then you can put the thread-pool on
`1,3,5,7,9,11,13,15`. On the other hand, if you have one NUMA node, you can use
either isolated cores or non isolated cores, but make sure that isolated cores
are not the ones defined earlier for DPDK/xran.
<details>
<summary>Once the gNB runs, you should see counters for PDSCH/PUSCH/PRACH per
antenna port, as follows (4x2 configuration):</summary>
```
[NR_PHY] [o-du 0][rx 24604 pps 24520 kbps 455611][tx 126652 pps 126092 kbps 2250645][Total Msgs_Rcvd 24604]
[NR_PHY] [o_du0][pusch0 10766 prach0 1536]
[NR_PHY] [o_du0][pusch1 10766 prach1 1536]
```
</details>
The first line show RX/TX packet counters, i.e., packets received from the RU
(RX), and sent to the RU (TX). In the second and third line, it shows the
counters for the PUSCH and PRACH ports (2 receive antennas, so two counters
each). These numbers should be equal, otherwise it indicates that you don't
receive enough packets on either port.
<details>
<summary>If you see many zeroes, then it means that OAI does not receive
packets on the fronthaul from the RU (RX is almost 0, all PUSCH/PRACH counters
are 0).</summary>
```
[NR_PHY] [o-du 0][rx 2 pps 0 kbps 0][tx 1020100 pps 127488 kbps 4717971][Total Msgs_Rcvd 2]
[NR_PHY] [o_du0][pusch0 0 prach0 0]
[NR_PHY] [o_du0][pusch1 0 prach1 0]
[NR_PHY] [o_du0][pusch2 0 prach2 0]
[NR_PHY] [o_du0][pusch3 0 prach3 0]
```
</details>
In this case, please make sure that the O-RU has been configured with the right
ethernet address of the gNB, and has been activated. You might enable port
mirroring at your switch to capture the fronthaul packets: check that you see
(1) packets at all (2) they have the right ethernet address (3) the right VLAN
tag. Although we did not test this, you might make use of the [DPDK packet
capture feature](https://doc.dpdk.org/guides/howto/packet_capture_framework.html)