[Intel-wired-lan] Slow e1000e Network Interface with different kernel

[Sasha Neftin <sasha.neftin@intel.com>]

On 9/2/2021 13:01, Marco Witte wrote:
> Scenario: Plugin into network, establishes link and IP is assigned.
> scp from another machine in the same subnet gives approx. 1kb/sec.
> Cross check with an usb 3 dock with integrated network adapter. Full speed.
> 
> Kai Heng-Feng build a patch for tgp https://lkml.org/lkml/2021/7/12/2927
> His deb kernel packages with that patch based on 5.10.x kernel ran full 
> throttle on this machine.
> However this was the only successfull attempt to get full speed.
> 
> The Kernel Mainline 5.13. contains visual similar patches, but they 
> still have the slow down on the same machine.
> Some people suspect pcie changes at that point.
> 
> Some curious fact I found out while testing: I booted up a manjaro 
> (current) usb stick and had full speed on the e1000e. Then I installed 
> manjaro from that stick to the harddrive. Booted that and it didn't 
> perform well.
> 
> As this is my first rodeo on this mailinglist, I need to reference some 
> information:
> 
> Referencing: https://bugzilla.kernel.org/show_bug.cgi?id=213377
> Here is the launchpad: 
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1927925
> e1000e Sourceforge bugreport(s): https://sourceforge.net/p/e1000/bugs/681/
> This is still an issue with all current mainline kernels. Last test was 
> 5.14 RC7
> 
> I can provide any output you need.
> 
Marco,
Run echo on > /sys/bus/pci/devices/0000\:00\:16.0/power/control command 
on your machine.
Please, let us know the result.

> 
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Sasha