arm64 idle cpu usage very high

[olifink]

Version

Microsoft Windows [Version 10.0.22623.875]

WSL Version

• WSL 2
• WSL 1

Kernel Version

5.15.68.1-microsoft-standard-WSL2

Distro Version

Ubuntu 20.04

Other Software

Project Voltera/Windows Dev Kit 2023 arm64 / aarch64

Repro Steps

Only on Project Voltera/Windows on Arm/Windows DevKit 2023

Start WSL shell

observe CPU usage jumps to 30% total (~80% on 4 of 8 processors)
vmwp.exe shows high load in process list as well

Stop WSL
wsl.exe -t Ubuntu
observe after ~60s everything back to normal, vmwp.exe no longer running

Expected Behavior

On Intel x86_64 Surface Studio 2 no such impact is observable when starting/stopping WSL

Actual Behavior

nothing fails, but CPU/power usage unnecessary high when WSL is in background

Diagnostic Logs

No response

[ms300]

same problem with dev kit 2023.
vmwp.exe and System consumes about 30% CPU all the time when WSL is running but idle.

Debian distro

[Gerdya]

See here:
microsoft/wslg#819

Same Problem on my Surface Pro X as well as on my Devkit 2023.

[vanc]

Same issue here with devkit 2023. So either try the previous build 25211, or wait for the fix to make into release channel.

[olifink]

I can't recommend 25236 in the dev channel at the moment, although I can confirm it fixes the high cpu usage issue on one of my DevKits now - but introduces rendering problems in Edge and other apps. Also, it's a pain to opt out of again (reinstall) so I'm hoping the wsl fixes are moved into the beta channel quick

[cyclesax]

To try and fix this issue on my Dev Kit 2023 I installed dev channel build of Windows 25236, but then the machine would not boot so I'm reinstalling Win11 from cloud using reset/restore option ... and that's currently appearing to stuck at 75%. I guess I should have just put up with it and waited until it was fixed in mainstream or beta channels.

[ms300]

issue was fixed on 22621 with KB5020044. Well done!

[grealish]

So this is also the case with the Lenovo X13s, high idle CPU around 15%~25%, enough that is drains the battery very fast and makes the laptop sluggish, I'll give 22621 with KB5020044 a go and see if things changed

[olifink]

I can confirm it's fixed for me also with 22621 in regular Insider now on DevKit 2023

[JesseChain]

Not only that, it often throws a timeout error when booting on matebook e go, and executing wsl --shutdown sometimes leads to a blue screen.

[roadrunner-gs]

occasionally after after sleep the vmmemWSL-process gets unresponsive and the jupyter-notebook i launched in it alongside. wsl --shutdown is not working either and the process is not killable via taskmanager.

[JesseChain]

After upgrading to win11 22h2, this problem was solved.

Still haven't been able to solve this problem on 22h2.

[2hansen]

Not solved for me. Still very unstable WSL-experience on my Surface Pro 9 (SQ3). But I noticed this: "Fixed an issue causing VmmemWSL to sometimes use an unexpectedly large amount of CPU and lead to freezing on ARM64 devices over time." from https://betawiki.net/wiki/Windows_11_build_25247 - so maybe something is in the works concerning this? I am not in a situation where I can fast forward to 25247 (still on 22623), but maybe there's hope?

[2hansen]

https://github.com/microsoft/WSL/releases/tag/1.1.7 looks promising.

[microsoft-github-policy-service]

This issue has been automatically closed since it has not had any activity for the past year. If you're still experiencing this issue please re-file this as a new issue or feature request.

Thank you!