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[Bug 1923648] Re: macOS App Nap feature gradually freezes QEMU process
From: |
Thomas Huth |
Subject: |
[Bug 1923648] Re: macOS App Nap feature gradually freezes QEMU process |
Date: |
Sat, 15 May 2021 10:22:42 -0000 |
The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.
If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".
If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:
1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:
https://gitlab.com/qemu-project/qemu/-/issues
and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.
2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).
Thank you and sorry for the inconvenience.
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1923648
Title:
macOS App Nap feature gradually freezes QEMU process
Status in QEMU:
Incomplete
Bug description:
macOS version: 10.15.2
QEMU versions: 5.2.0 (from MacPorts)
5.2.92 (v6.0.0-rc2-23-g9692c7b037)
If the QEMU window is not visible (hidden, minimized or another
application is in full screen mode), the QEMU process gradually
freezes: it still runs, but the VM does not respond to external
requests such as Telnet or SSH until the QEMU window is visible on the
desktop.
This behavior is due to the work of the macOS App Nap function:
https://developer.apple.com/library/archive/documentation/Performance/Conceptual/power_efficiency_guidelines_osx/AppNap.html#//apple_ref/doc/uid/TP40013929-CH2-SW1
It doesn't matter how the process is started -- as a background job or
as a foreground shell process in case QEMU has a desktop window.
My VM does not have a display output, only a serial line, most likely
if the VM was using OpenGL, or playing sound (or any other App Nap
triggers), then the problem would never have been detected.
In my case only one starting way without this problem:
sudo qemu-system-x86_64 -nodefaults \
-cpu host -accel hvf -smp 1 -m 384 \
-device virtio-blk-pci,drive=flash0 \
-drive
file=/vios-adventerprisek9-m.vmdk.SPA.156-1.T.vmdk,if=none,format=vmdk,id=flash0
\
-device e1000,netdev=local -netdev
tap,id=local,ifname=tap0,script=no,downscript=no \
-serial stdio -display none
The typical way from the internet to disable App Nap doesn't work:
defaults write NSGlobalDomain NSAppSleepDisabled -bool YES
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- [Bug 1923648] Re: macOS App Nap feature gradually freezes QEMU process,
Thomas Huth <=