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VMs (virt-manager) are slow on 21.04 but not 20.04

us flag

On Ubuntu 21.04, VMs run slow. I used Ubuntu 21.04 on both host and guest and the VMs were very slow, even on moving the windows with the mouse. I had to go back to Ubuntu 20.04 where they work fine.

I use virt-manager by the way, installed through sudo apt-get install -y virt-manager, I did not change any VM configurations, I simply created a new one and installed.

What could possibly be happening?

I'd like to use 21.04 because it solves a problem with HDMI on my notebook. On 20.04 the second monitor HDMI keeps glitching when I move things on the screen.

Christian Ehrhardt avatar
sl flag
The two most common issues in regard to "feels slow" are a) it isn't detecting/working KVM and runs in emulation (you could check the commandline the qemu process was started if it contains -enable-kvm or -accel ...kvm b) is about the way things are drawn e.g. if your 21.04 ran on wayland -maybe run `echo $XDG_SESSION_TYPE` on host and guest to check that? If you ran all that on the same system without wiping it (just up/downgrades - then you'll find logs in /var/log/libvirt/qemu/<guestname>.log which might be interesting to compare between good/bad case. Could you add that data to the post?
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