RHEL 7 system experiences connectivity issues while under load.

Solution Verified - Updated -

Issue

  • A RHEL 7 host may lose some network connectivity, possibly for minutes at a time.
  • May affect NFS and trigger nfs: server [...] not responding, still trying log messages on an NFS client machine.
  • Connectivity with some subset of remote hosts may continue to function as expected while this is occurring.
  • No obvious OS network error counter related to the issue.

Environment

  • Red Hat Enterprise Linux 7
  • Possibly trigger by heavy network or memory load
  • Possibly more likely to occur in environments with large MTU (Jumbo frames)
  • Seen on an NFS client with kernel 3.10.0-957.5.1.el7 or NFS server with 3.10.0-862.14.4.el7, but applications other than NFS affected as well
  • ixgbe and mlx5 based NICs (possibly others)

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