DPDK packet lost and disorder - dpdk

Question

I did a simple test program using DPDK: program1 in computer1 is to send packet, and program2 in computer2 is to receive packet. computer1 and computer2 are directly connected, no switch.
In program 1, I use a packId to indicate the sequence of packet id.
while(true){
pkt = rte_pktmbuf_alloc(mbuf_pool);
uint8_t* pchar = rte_pktmbuf_mod(pkt, uint8_t*);
//set mac address and packet length. (pkt 0 to pkt 13).
//use from byte 14 to store uint_64 packId;
uint64_t* pPackId = (uint64_t*)(pchar+14);
*pPackId = packId;
packId++;
//put 1024 bytes data inside packet.
uint16_t sent = rte_eth_tx_burst(0, 0, &pkt, 1);
while(sent!=1)
{
sent = rte_eth_tx_burst(0, 0, &pkt, 1);
}
}
In receiver, i define long RX ring: nb_rxd=3072:
rte_eth_dev_adjust_nb_rx_tx_desc(0, &nb_rxd, &nb_txd);
rte_eth_rx_queue_setup(0, 0, nb_rxd, rte_eth_dev_socket_id(0), NULL, mbuf_pool);
There is a for loop to receive packets, and check packet sequence id.
for(;;)
{
strcut rte_mbuf *bufs[32];
const uint16_t nb_rx = rte_eth_rx_burst(0, 0, bus, 32);
if(unlikely(nb_rx==0))
continue;
int m = 0;
for (m=0; m<nb_rx;m++)
{
uint8_t* pchar = rte_pktmbuf_mtod(buf[m], uint8_t*);
uint64_t* pPackId = pchar+14;
uint64_t packid = *pPackId;
if(expectedPackid!=packid){
printf...
expectedPackid = packid+1;
}
else expectedPackid++;
}
}
Based on program2, I see a lot of packet lost and disorder. The received packet is put inside the ring buffer. Should it receive in order, and I also find there is packet lost, but my program1's sending speed is only around 1gbps.

Answer 1

rte_eth_stats_get() is very useful for troubleshooting. From the rte_eth_stats, I found ipackets is correct, q_ipackets[0] is correct, and imissed is 0, ierrors is 0, rx_nombuf is 0, q_errors[0] is 0. So it should be codes in program2 has problem. After check codes, it is because some memory management in program2.