No SYS%LPI residency in suspend when ethernet is connected

[Kai-Chuan Hsieh]

Try the command

# turbostat -S --show Pkg%pc2,Pkg%pc3,Pkg%pc6,Pkg%pc7,Pkg%pc8,Pkg%pc9,Pk%pc10,CPU%LPI,SYS%LPI rtcwake -m mem -s 15
...
Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8 Pkg%pc9 Pk%pc10 CPU%LPI SYS%LPI
9.78 0.25 0.86 6.21 4.37 0.00 67.53 67.67 0.00

There is no SYS%LPI residency.
Unplug ethernet, the residency become

Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8 Pkg%pc9 Pk%pc10 CPU%LPI SYS%LPI
8.63 0.13 0.07 22.56 1.24 0.00 53.95 54.08 53.82

The ethernet controller is I219-LM.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.14.0-1024-oem 5.14.0-1024.26
ProcVersionSignature: Ubuntu 5.14.0-1024.26-oem 5.14.21
Uname: Linux 5.14.0-1024-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 2 05:24:51 2022
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-focal-amd64-20200502-85+fossa-pidgeot+X92
InstallationDate: Installed on 2021-11-03 (118 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-oem-5.14
UpgradeStatus: No upgrade log present (probably fresh install)

[Kai-Chuan Hsieh (kchsieh)]

Upload sos report.

[koba (kobako)]

On cinnamo bay 16, With 5.14-oem-1032 and i219's lan connected,
PHM show PCIeLPM always L1 and GBE is on.
here's phm screen shot,

[koba (kobako)]

with 518rc1, there would encounter e1000e hang issue, even this patch has landed since 5.17rc7.
git tag --contains 1866aa0d0d
v5.17
v5.17-rc7
v5.17-rc8
v5.18-rc1
v5.18-rc2
~~~

Need Intel's help to figure out the hang issue and i219-lm power performance issue.

[koba (kobako)]

the root cause is the i219-lm keeps the link up during suspend.
Is there a requirement that ethernet links must be down during suspend?

[Kai-Chuan Hsieh (kchsieh)]

If the platform estar8 passed, then it is okay. if not, if might be an issue that increase power consumption.

[koba (kobako)]

@KC, do you know if the ethernet presents during estar assessment?
If ethernet is not essential, estar may be passed.

[Kai-Chuan Hsieh (kchsieh)]

The ethernet needs to be connected during the test. Not all platforms are failed. I think it is still an issue that ethernet should not block CPU be in low power idle, but it doesn't block anything at the moment.