On Sun, May 2, 2021 at 1:16 PM T K Sourabh <sourabhtk37@xxxxxxxxx> wrote: > > On Sat, May 1, 2021 at 11:26 PM Zvi Effron <zeffron@xxxxxxxxxxxxx> wrote: > > > > I am wondering if not having the matching queues for the ingress > > interface and egress interface on the same cores might be a > > contributing factor? > I haven't tested but you could give it a try to see if packet drop happens. I have now tested matching the IRQs for queue N on both the ingress and egress interfaces so they are on the same core. (Queue 0 for ingress and egress are on the same core, the same for queue 1 on each, etc, but queue 0 and queue 1 are on different cores). This did not resolve the packet loss. I'm at a loss for what could be causing the packet loss. It's clearly something to do with the IRQ remapping, as all I need to do to remove the loss is comment out the write to the smp_affinity files. I'm suspecting it's something with how XDP_REDIRECT is implemented in the i40e driver, but I don't know if this is a) cross driver behavior, b) expected behavior, or c) a bug. --Zvi
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