Poor TCP transmit throughput with Intel I219-LM and I219-V network interface
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
e1000eadpater 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
e1000edriver - Transmission Control Protocol (TCP) network traffic
- TCP Segmentation Offloading (TSO) enabled on NIC
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