I am using an up-to-date version of manjaro mate and have virt-manager 3.2.0-1 installed on my Thinkpad E14 (AMD Ryzen 5 4500U). Using either GNOME Boxes or virt-manager it is really slow:

enter image description here

It really bothers me because I know it just work flawlessly in the past. Unfortunately I don’t know what update caused this issue. I did a reinstall but the issue still persists. I tried using Ubuntu MATE but it is also very slow there. I used quickemu as well and it just worked perfect back then, currently installation fails.

I do not know whether this issue has something to do with this one. But there I got a error

/usr/share/libdrm/amdgpu.ids: No such file or directory

and actually amdgpu.ids is located in/var/lib/mhwd/ids/pci/amdgpu.ids.

I know the data availability is not great but maybe someone with AMD Ryzen experiences similar issues that can be resolved.

I tried using virtualbox and there are no performance issues, however I really prefer using GNOME Boxes or virt-manager.

Thanks for any ideas!

  • Please show qemu cmdline as it is visible in ps -axo args | grep '[q]emu'.
    – Jiri B
    Mar 29, 2021 at 11:52
  • this commando shows nothing :(
    – Mickey
    Mar 29, 2021 at 12:37

3 Answers 3


I was wrong to say the code to mitigate spectre/meltdown was the reason for the low performance. Turns out virt-manager was locked to one core which I fixed it by changing Whonix-Workstation*.xml at line 12 (approx) remove cpuset =1 and between opening and closing brackets of vcpu define the amount of cores Eg.4 . Then applying the changes using

sudo virsh -c qemu:///system define Whonix-Workstation*.xml

In my case I had 8 logical cores I assigned half to the Gateway and half to workstation so they don't overlap.


It's slow even for me. It's because they included code to mitigate spectre and meltdown attacks on the hypervisor.

  • Welcome to the site, and thank you for your contribution. Perhaps you could add some links to references for the statements you made?
    – AdminBee
    Jun 9, 2021 at 9:49
  • But why is virtualbox then fine?
    – Mickey
    Jun 10, 2021 at 8:20

So I changed the video settings to Virtio and now it's running pretty decent!

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