RHEL7: iperf performance with 2 streams from different machines is inconsistent

Solution Verified - Updated -

Issue

  • Consistent network packet retries; Re-transmit timeouts; Loss of network bandwidth between servers.
  • Expectation: We expect to have little or no network packet retries, timeouts, and/or loss of bandwidth. We have confirmed with network team that the network switch is not really busy but still its causing loss of bandwidth and timeouts.

Environment

  • Red Hat Enterprise Linux 7.3 - kernel-3.10.0-514.el7 series
  • Red Hat Enterprise Linux 7.2 - kernel-3.10.0-327.el7 series
  • TCP
  • Most commonly seen with 10Gbps network interfaces (eg: ixgbe, be2net, etc)

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