You still need to account for NIC-to-NIC packet transfers for scenarios where pkt arrives on Phy NIC A and needs to egress via Phy NIC B. Obviously there are be

You still need to account for NIC-to-NIC packet transfers for scenarios where pkt arrives on Phy NIC A and needs to egress via Phy NIC B. Obviously there are better options than just PCIe transport these days.