Packet drops on NIC with many RX/TX queues configured per CPU core

Solution In Progress - Updated -

Issue

  • Flurries of network activity result in RX dropped packets.

Environment

  • Red Hat Enterprise Linux 6 (RHEL6)
  • Red Hat Enterprise Linux 7 (RHEL7)
  • NUMA hardware
  • Most prevalent on high (12+) core-count CPU sockets
  • Various indicators of RX dropped that are not otherwise resolved.
  • High number of interrupt queues being handled by individual cores.

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