I219-LM and e1000e driver
"Fresh kernels often include facepalm-grade fixes and this time around there's an update that ensures an Intel gigabit NIC can approach its promised throughput. Since 2020 the kernel has unwittingly throttled it to 60 percent of that speed."
And it's only been a problem for 8 years and 9 months.
Biting the hand that feeds IT
