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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
Status: RESOLVED UPSTREAM
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: AMD64 Linux
: Normal normal
Assignee: Distribution Kernel Project
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-03-28 17:56 UTC by ixuz
Modified: 2023-10-18 17:37 UTC (History)
1 user (show)

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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:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1802691
https://docs.hetzner.com/robot/dedicated-server/troubleshooting/performance-intel-i218-nic/

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.
Comment 1 ixuz 2023-10-18 17:37:18 UTC 
Thanks for not even responding...

Anyways, in the meantime the bug is fixed by upstream: https://www.phoronix.com/news/Intel-i219-LM-Linux-60p-Fix

I can confirm this, tested with Kernel 6.1.58-gentoo-dist.