# How to Get Rid of Sub Optimal Warning

## "Sub optimal" Waning

```
Gateway -> Routes
```

<figure><img src="/files/gM0SFyWxrD2CAeHtFfvq" alt=""><figcaption></figcaption></figure>

## Reason for the Waning

The reason for this is that some Nics (Azure, vmxnet3, e1000, ixgbe vf) report a RETA size of 0 while reporting multiple rx queues, meaning they can not support multiple CPUs. However TBRouter is not aware of this limit on those Nics then initiate the Cores on the Nics

### Solutions

We have ticket 23762 to improve the tbrouter to support RSS when we have a RETA table of 0. You will experience this warning before the fix. You can: 1-Just simply ignore the warning. 2- Change the nic.json to remove the section with the extra cores (so those cores can be used for something else) by following the below steps.

### Steps to Get Rid of The Warning

1\. ssh to the SBC host and do shell command:

locate nic.json Output: /usr/lib/tb/toolpack/setup/12358/3.0/dynamic\_nic.json /usr/lib/tb/toolpack/setup/12358/3.0/nic.json /usr/lib/tb/toolpack/setup/12358/3.0/validated\_nic.json /usr/lib/tb/toolpack/setup/12358/3.1/current\_nic.json /usr/lib/tb/toolpack/setup/12358/3.1/dynamic\_nic.json /usr/lib/tb/toolpack/setup/12358/3.1/nic.json /usr/lib/tb/toolpack/setup/12358/3.1/validated\_nic.json /usr/lib/tb/toolpack/tbrouter/current\_nic.json

2\. Do a copy of the existing nic.json (only need to operate the version your SBC is running)

e.g. cp /usr/lib/tb/toolpack/setup/12358/3.1/nic.json /usr/lib/tb/toolpack/setup/12358/3.1/nic\_bak.json

<br>

3\. Edit nic.json

e.g. vim /usr/lib/tb/toolpack/setup/12358/3.1/nic.json

4\. Remove the section with the extra cores

e.g. below is the section for one Nic with 2 cores, simply remove the section of "core": 2,

```
       "00:50:56:95:ba:0e": {
           "cores": [
               {
                   "core": 1,
                   "rx_nb_queues": 2
               },
               {
                   "core": 2,
                   "rx_nb_queues": 2
               }
           ],
```

Make it simply like this:

```
       "00:50:56:95:ba:0e": {
           "cores": [
               {
                   "core": 1,
                   "rx_nb_queues": 2
               }
           ],
```


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