My NIC has 32 RX and 32 TX queues.

Now given this API,

static uint16_t rte_eth_tx_burst	(	uint16_t	port_id,
		uint16_t	queue_id,
		struct rte_mbuf **	tx_pkts,
		uint16_t	nb_pkts
	)

I gather the most natural approach for efficient packet transmissions is,

- assign one core to TX on a given port, queue since I/O through different queues is essentially independent
- arrange packets in memory buffers so packets for the same queue are in the same buffer

The RX side is much the same:

static uint16_t rte_eth_rx_burst	(	uint16_t	port_id,
		uint16_t	queue_id,
		struct rte_mbuf **	rx_pkts,
		const uint16_t	nb_pkts
	)