Hello, I am trying to use rte_epoll_wait() to avoid rx polling and reduce CPU utilization while preserving low latency. I am using the Intel X550-T2 NIC with DPDK 23.11 and the ixgbe driver.
I was able to make interrupts work and my process is getting interrupts when a packet arrives. I followed the example here: https://stackoverflow.com/questions/69792978/using-interrupts-with-dpdk Before calling rte_epoll_wait(), I must first arm the interrupt by calling rte_eth_dev_rx_intr_enable() every time my thread is about to wait. However, if a packet arrives between these calls, the interrupt will not work and my process will only resume once the timeout is reached. This causes huge latency spikes unless my timeout is very short, and the minimum time of 1ms is still too long to tolerate this problem, since my goal is to keep latency low. Here are my questions: 1) Is there a way to prevent the thread from suspending at all if the interrupt is not "armed" anymore? 2) Is it possible to set a timeout shorter than 1 ms? It looks like this is not supported by rte_epoll_wait(). Thank you, -Alan Beadle
