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I understand these errors started popping from DPDK 20.11.1 due to extended= ack support was added in Linux version 4.17 And used for diagnosing the TAP config in kernel.=20 Is it because we are trying to delete the qdisc before they are created ? And looks like the failure is per queue.=20 Am I missing any packages ? How to avoid these errors ? If they are not serious, is there a way to suppress them ? net_vdev_netvsc: probably using routed NetVSC interface "s0p0" (index 7) tap_nl_dump_ext_ack(): Cannot delete qdisc with handle of zero tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid net_vdev_netvsc: probably using routed NetVSC interface "s1p0" (index 8) tap_nl_dump_ext_ack(): Cannot delete qdisc with handle of zero tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid Currently using below kernel:=20 5.4.17 x86_64 GNU/Linux #3 SMP PREEMPT Thu Aug 18 05:23:39 UTC 2022 Thanks, Raghava Dattu.