NFS throughput is dramatically slow when TCP send queue is full due to network performance

Solution Unverified - Updated -

Issue

  • NFS throughput is dramatically slow when a TCP send queue used by NFS is full due to network performance.
  • nfsiostat command shows a large avg exe number than avg RTT.

Environment

  • Red Hat Enterprise Linux 7.1 or earlier
  • Red Hat Enterprise Linux 6.4 or earlier
  • NFS client
  • Slow/delayed network

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