e1000e extremly slow

[hendrik]

We have dell latitude 5420 & 5520 laptops with onboard intel ethernet controller.
Problem is that the ethernet port is extremely slow. about 100kbyte/s download throughput while on a gigabit connection. Upload seems to work just fine.

Also when I pxe boot the system it's also painfully slow.

But here comes the funny part. When I attach a usb memory stick the throughput of the networkcontroller is as expected.

I've used latest ubuntu 20.04.2 kernel 5.6.0-1032-oem (Certified by ubuntu and dell)
I've used latest ubuntu 20.04.2 kernel 5.10.0-1029-oem
I've used latest ubuntu 20.04.2 kernel 5.8.0-55

Turns out this problem is not showing up when I manually install the 5.8.18 kernel.

Also when I create my own iso with the help of Cubic and install the 5.8.18 kernel in it the pxe boot is working as expected with high throughput

system: Dell latitude 5420 + 5520
nic: Ethernet Connection (13) I219-LM
ubuntu 20.04.2
module: e1000e

Please assist. Thank you

[hendrik (hendrikp)]

To whom is may concern. I found the workaround for this.

The trick is to set the boot kernel parameter "pcie_aspm=off" in '/etc/default/grub'

Like this:

GRUB_CMDLINE_LINUX_DEFAULT="splash pcie_aspm=off"

After that run;

update-grub

pcie_aspm is some sort of power management thingie which probably puts my networkcontroller to sleep or something.
And putting a usb memory stick in the laptop some how wakes it up.

[hendrik (hendrikp)]

Finally somebody else who is reporting the same.
https://askubuntu.com/questions/1344532/wired-network-extremely-slow/1345978#1345978

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.