Poor TCP transmit throughput with Intel I219-LM and I219-V network interface

Solution Verified - Updated -

Issue

  • Poor TCP transmit throughput with Intel I219-LM and I219-V network interface
  • Network performance on Intel I217-LM rev 5 NIC is abnormally slow
  • I219-LM e1000e adpater performance halves
  • Slower than expected transmit rate from RHEL 7.5 to any other system.
  • rsync, and iperf3 on system with around 500 mbit/s upload, download is normal.

Environment

  • Red Hat Enterprise Linux 7.5
  • Intel I219-LM or I219-V or I219-LM NIC using e1000e driver. PCI IDs:
    • I218LM - 0x8086 0x155A, 0x15A0, 0x15A2
    • I218V - 0x8086 0x1559, 0x15A1, 0x15A3
    • I219LM - 0x8086 0x156F, 0x15B7, 0x15D7, 0x15E3, 0x15B9
    • I219V - 0x8086 0x1570, 0x15B8, 0x15D8, 0x15D6
  • Transmission Control Protocol (TCP) network traffic
  • TCP Segmentation Offloading (TSO) enabled on NIC

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