IP Fragment drops high in RHEL8/9

Solution In Progress - Updated -

Issue

  • Host is experiencing lot of oracle database alert logs on one node
    • Errors include 'ERRCHK' and 'PT DMP_REQ'
    • Peer addresses and port numbers are mentioned in the error messages
  • The application uses large UDP packets that will be fragmented.
  • nstat shows constantly increasing IpReasmFails and IpReasmTimeout
  • /proc/net/sockstat shows FRAG: memory very close and often equal to net.ipv4.ipfrag_high_thresh

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Oracle environments commonly cause IP fragmentation, but this can happen for any application that causes IP fragmentation

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