vyos has supported RPS for a long time, but sometimes it is better to have RFS with RPS
```
sysctl -w net.core.rps_sock_flow_entries=32768
echo 32768/N > /sys/class/net/eth5/queues/rx-0/rps_flow_cnt
```
N: Usually should be the number of queues
note: https://lwn.net/Articles/381955/