Poor TCP transmit throughput with Intel I219-LM/I219-V under RHEL8.5
Issue
- Poor TCP transmit throughput with Intel I219-LM/I219-V network interface
- I219-LM/I219-V
e1000e
adpater performance halves - Slower than expected transmit rate on RHEL 8.5 and later
- iperf3 on system with around 700 mbit/s upload
Environment
- Red Hat Enterprise Linux 8.5 and later
- Intel I219-LM/I219-V NIC using
e1000e
driver. PCI IDs:- I219LM -
0x8086-0x15B7
- I219-V -
0x8086-0x15B8
- I219LM -
- Transmission Control Protocol (TCP) network traffic
- TCP Segmentation Offloading (TSO) enabled on NIC
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