Background
This question is regarding an application that uses DPDK to process incoming UDP packets. I am trying to get as close to lossless transmission as possible, but still seeing small amounts of packet loss. The packets are transmitted directly from one computer to another with no switch between the two, so I expect to have minimal to no packet loss.
What I know
According to the results of rte_eth_stats_get(rte_eth_stats *stats), the lost packets are completely attributed to q_errors. According to the DPDK Documentation, q_errors denotes the "Total number of queue packets received that are dropped", as opposed to ierrors, which denotes the "Total number of erroneous received packets".
What I would like to know
Does anyone know what some typical causes of q_errors may be that are more specific than the DPDK documentation? Maybe this packet loss is inevitable due to the nature of UDP, but I would like to know where to look for problems in case the packet loss is not inevitable.