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Bug 778983 - sys-kernel/gentoo-kernel-bin:[5.4.*|5.10.*] slow send speed with Intel I219-V
Summary: sys-kernel/gentoo-kernel-bin:[5.4.*|5.10.*] slow send speed with Intel I219-V
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: AMD64 Linux
: Normal normal (vote)
Assignee: Distribution Kernel Project
Depends on:
Reported: 2021-03-28 17:56 UTC by ixuz
Modified: 2021-04-02 23:04 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description ixuz 2021-03-28 17:56:51 UTC
Send speed (means upload/TX) does not reach full Gigabit speed. Tested with iperf3 it hovers around 780Mbit/s max.

This is a known bug. See:

Disabling TCP segmentation offload via ethtool works as workaround.

As upstream does not seem to fix this, is there any chance we get a Kernel patch from gentoo (like Ubuntu did)?

Reproducible: Always

Steps to Reproduce:
1.Use Intel I219-V NIC.
2.Test transmit speed via iperf3 or Samba or whatever.
Actual Results:  
Upload speed max 780Mbit/s

Expected Results:  
Upload speed should reach around 940Mbit/s.