iperf does not reach full speed on fast network connection such as 40 Gbps or 100 Gbps

Solution Verified - Updated -

Issue

  • iperf does not reach full speed on fast network connection such as 40 Gbps or 100 Gbps
  • Testing with iperf seems to reach a bottleneck or speed limit below NIC speed

Environment

  • Red Hat Enterprise Linux
  • High speed network interface such as 40 Gbps or 100 Gbps
  • Bandwidth test such as iperf or netperf

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