Some PMD Vector Rx for performance has an hidden limitation like :
/* nb_pkts shall be less equal than RTE_I40E_MAX_RX_BURST */
nb_pkts = RTE_MIN(nb_pkts, RTE_I40E_MAX_RX_BURST);
/* nb_pkts has to be floor-aligned to RTE_I40E_DESCS_PER_LOOP */
nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_I40E_DESCS_PER_LOOP); <------
;-)
#define RTE_I40E_DESCS_PER_LOOP 4
BR,
Haiyue
> -----Original Message-----
> From: dev [mailto:dev-boun...@dpdk.org] On Behalf Of Perugu Hemasai Chandra
> Prasad
> Sent: Tuesday, September 3, 2019 13:00
> To: us...@dpdk.org; dev@dpdk.org
> Subject: [dpdk-dev] unable to receive packets less than 4 with
> rte_eth_rx_burst Api -regarding.
>
> Hi All,
> I am trying to receive packets transmitted by another DPDK
> application running on different system. I am able to transmit packets with
> a burst value of 1 using rte_eth_tx_burst Api, but unable to receive
> packets with a burst value less than 4 using rte_eth_rx_burst Api. can
> anyone please tell me the reason behind that? Is that because of any EthDev
> configuration?. How to receive packets with a burst value of 1?
>
> Thanks & Regards,
> Hemasai
