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I would like to know the >>>>>>>>>>>> NVM version that you have on your device. >>>>>>>>>>> >>>>>>>>>>> driver: e1000e >>>>>>>>>>> version: 6.14.1+ >>>>>>>>>>> firmware-version: 1.1-4 >>>>>>>>>>> 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: yes >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Your firmware version is not the latest, can you check with the board >>>>>>>>>> manufacturer if there is a BIOS update to your system? >>>>>>>>> >>>>>>>>> I can check, but still, it's a regression in the Linux driver - old >>>>>>>>> kernel did work perfectly well on this hw. Maybe new driver tries to use >>>>>>>>> some feature that is missing (or broken) in the old firmware? >>>>>>>> >>>>>>>> A little bit of context: I'm maintaining the kernel package for a Qubes >>>>>>>> OS distribution. While I can try to update firmware on my test system, I >>>>>>>> have no influence on what hardware users will use this kernel, and >>>>>>>> which firmware version they will use (and whether all the vendors >>>>>>>> provide newer firmware at all). I cannot ship a kernel that is known >>>>>>>> to break network on some devices. >>>>>>>> >>>>>>>>>> Also, you mentioned that on another system this issue doesn't reproduce, do >>>>>>>>>> they have the same firmware version? >>>>>>>>> >>>>>>>>> The other one has also 1.1-4 firmware. And I re-checked, e1000e from >>>>>>>>> 6.14.2 works fine there. >>>>> >>>>>>> Thank you for your detailed feedback and for providing the requested >>>>>>> information. >>>>>>> >>>>>>> We have conducted extensive testing of this patch across multiple systems >>>>>>> and have not observed any packet loss issues. Upon comparing the mentioned >>>>>>> setups, we noted that while the LAN controller is similar, the CPU differs. >>>>>>> We believe that the issue may be related to transitions in the CPU's low >>>>>>> power states. >>>>>>> >>>>>>> Consequently, we kindly request that you disable the CPU low power state >>>>>>> transitions in the S0 system state and verify if the issue persists. You can >>>>>>> disable this in the kernel parameters on the command line with idle=poll. >>>>>>> Please note that this command is intended for debugging purposes only, as it >>>>>>> may result in higher power consumption. >>>>>> >>>>>> I tried with idle=poll, and it didn't help, I still see a lot of packet >>>>>> losses. But I can also confirm that idle=poll makes the system use >>>>>> significantly more power (previously at 25-30W, with this option stays >>>>>> at about 42W). >>>>>> >>>>>> Is there any other info I can provide, enable some debug features or >>>>>> something? >>>>>> >>>>>> I see the problem is with receiving packets - in my simple ping test, >>>>>> the ping target sees all the echo requests (and respond to them), but >>>>>> the responses aren't reaching ping back (and are not visible on tcpdump >>>>>> on the problematic system either). >>>>> >>>>> As the cause is still unclear, can the commit please be reverted in the >>>>> master branch due adhere to Linux’ no-regression policy, so that it can be >>>>> reverted from the stable series? >>>>> >>>>> Marek, did you also test 6.15 release candidates? >>>> >>>> The last test I did was on 6.15-rc3. I can re-test on -rc5. >>> >>> Same with 6.15-rc5. >> >> And the same issue still applies to 6.16-rc2. FWIW Qubes OS kernel has >> this buggy patch revered and nobody complained (contrary to the version >> with the patch included). Should I submit the revert patch? It is not a good idea to revert this patch as most of the systems will encounter the original issues (PHY access and packet loss). The reason I first introduced this patch was because big vendors reported the packet loss issue. You can refer to the following sightings: https://answers.launchpad.net/ubuntu/+question/816003 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2066064 https://bugzilla.kernel.org/show_bug.cgi?id=218869 As an intermediate solution we can either use a privileged flag to make it configurable. I will share with you a patch that might fix the issue on your system that I would like you to try. FYI, we are currently investigating a similar issue that seems to be due to a misconfiguration of the system firmware. > > Just submit a revert then 👍 I have no authority here, but had good > experience with just sending a revert patch in the past 🤗 > > Cheers, > Chris