Comment # 37 on bug 1119649 from david chang

(In reply to Martti Laaksonen from comment #31)
> (In reply to david chang from comment #30)
> > (In reply to david chang from comment #29)
> > > Hi,
> > > 
> > > There is a similar issue upstream but with different chip.
> > > https://lore.kernel.org/netdev/aead4da3-e1b0-ab6c-2842-634e175b33ab@gmail.
> > > com/
> > > 
> > > Could you give it a try with the following kernel parameter separately.
> > > - pcie_aspm=off
> > > - pcie_aspm.policy=performance
> > > 
> > > Thanks!
> > 
> > Also could you please get the register dump of the interface from v4.18 and
> > v4.19 kernel?
> > # ethtool -d enp1s0
> 
> Alright, I tried both kernel parameters with 4.18.15 and 4.19.11 kernels but
> did not see any change in receive performance, i.e. kernel 4.18.15 performs
> well whereas kernel 4.19.11 crawls at 12 MB/s when receiving.
> 
> That PCIe ASPM policy setting probably does nothing since the kernel reports
> this:
> tammi 31 18:20:52 darkangel kernel: ACPI FADT declares the system doesn't
> support PCIe ASPM, so disable it
> tammi 31 18:20:52 darkangel kernel: acpi PNP0A08:00: _OSC: OS supports
> [ExtendedConfig ASPM ClockPM Segments MSI]
> tammi 31 18:20:52 darkangel kernel: acpi PNP0A08:00: FADT indicates ASPM is
> unsupported, using BIOS configuration
> 
> Test results attached. The register dumps you asked are also included in the
> results.

Thank you for the testing!

Did you ever do the performance test without NFS? ex: download directly or
iperf..