Inadvertently,I found Realtek NIC came in and out of the aspm L1 state
in an unreasonably high frequency even during downloading something.For
a NVME device,it does not show this symptom during it's working and
having workloads in flight which can be indicated by monitoring clkreq#
being asserted/d
If problem happens on certain platform,SOC/BIOS/NIC chipset are
something we know of,which combination of them causing the issue could
also be known by regression test.
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I could see this issue with same Call trace pasted above with ubuntu
20.04/20.10/21.04.
Had a look at relevant kernel code and found all of them disable only ASPM L1.1
rather than ASPM completely.Rebuilt the kernel by disabling whole ASPM feature
this NETDEV WATCHDOG call trace disappears.
code
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