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Since the python 3.9 update, my guest VMs (on Arch host) have incredibly bad performance.
For example, click & dragging the mouse on the desktop (XFCE on both Debian/Arch) in virt-viewer makes Xorg on the host use 100% of a CPU thread and the viewer output has extreme tearing.
I've downgraded all the packages that were updated and the issue is gone.
After downgrading, Xorg only goes up to 25% usage when doing the same test and the viewer looks correct.
So far before downgrading everything, I tried only xorg and virt-viewer/manager, both of which didn't work.
Now I don't know how to go about figuring out who to blame, since partially upgrading python might break my system.
Any help welcome.
Edit: So I have partially upgraded everything python or non-vm related and the performance is fine.
After upgrading slowly, the only thing left is cairo-1.17.4-1.
So for anyone dealing with virt-viewer in high resolutions (3840x2160 in my case), this is the issue.
Last edited by narkz (2020-12-04 01:00:29)
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Version 1.17.4-2 with disabled xlib-xcb fixes the issue.
More here: https://gitlab.freedesktop.org/cairo/cairo/-/issues/439
Thanks maintainers!
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