I can confirm that this bug exists on 18.04 and 18.10 on a Intel NUC 8i3BEH (with latest BIOS, 0056). After a few seconds after boot, the RTT spikes to well over 1s and makes the system unusable.
Device: 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (6) I219-V (rev 30) Subsystem: Intel Corporation Ethernet Connection (6) I219-V Flags: bus master, fast devsel, latency 0, IRQ 127 Memory at c0100000 (32-bit, non-prefetchable) [size=128K] Capabilities: [c8] Power Management version 3 Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Kernel driver in use: e1000e Kernel modules: e1000e # ethtool -i eno1 driver: e1000e version: 3.2.6-k firmware-version: 0.4-4 expansion-rom-version: bus-info: 0000:00:1f.6 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes supports-priv-flags: no Forcing the speed of the interface to 100 with autonegotiation off (via ethtool --change eno1 speed 100 autoneg off) helps somewhat - answer times stay around a few ms. Since changing the power management settings seems to solve this issue, i tried various options: Disable intel_pstate, change the governor to performance, forcing full frequency, etc. without luck. However, disabling PCIe ASPM *in the BIOS* solved the issue for me - at the price of a somewhat higher power consumption (around +5W). Please note that using pcie_aspm=off in the kernel command line (linux-image-4.18.0-14-generic) *did not work*. Here is the dmesg snippet with ASPM disabled in the BIOS: # dmesg | grep -i aspm [ 0.041040] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it [ 0.177567] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI] [ 0.181078] acpi PNP0A08:00: FADT indicates ASPM is unsupported, using BIOS configuration Please let me know, if you need more information. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1785171 Title: Intel I219-V Ethernet Interface on Ubuntu Linux Using e1000e Driver keeps Dropping Internet Connection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785171/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs