A responsive live desktop 21.04 image produces a slow VM image

user403329

1/20/23, 11:55 AM

When I boot up a live desktop ISO in Virtual Machine Manager (kvm/qemu), the live system is super snappy and when I look at the "Resources" in the System monitor the 4 supplied cores are pretty much idle (RAM: 6GB, no problem).

Then I install the 21.04 desktop as "minimal". After the reboot the responsiveness experienced in the live ISO is not there anymore in the "true" VM. I can wait for hours, but it never changes.

The System monitor always shows a fairly high CPU load (~50% on all cores). When the System monitor window is minified, the CPU load drops to idle. When I look at it with top, the CPU time is spent in various kworker processes.

I don't make any adjustments to the VM. The ISO and the VM are on the same SSD. The system is an AMD Threadripper running Ubuntu 21.04 as well.

How to reproduce

Grab 21.04 desktop live ISO
Create a new VM. I used ubuntu 20.10 as the next nearest known ubuntu to my kvm/qemu
Run VM, Choose "live"
Open Terminal, type something. Notice responsiveness
Open System Monitor, check Resources/CPUs
Now install with default settings except that I use LVM for partitioning
Reboot
Open "Terminal", notice lag when typing
Run "top", notice kworker processes
Open "System Monitor", notice CPU load
Minify "System Monitor"
Wait minutes or days
Open "System Monitor" again, notice CPU load

0 + 0

cpu-load

kvm

virtualization

21.04

user403329

1/20/23, 5:07 PM

I just tried Manjaro GNOME 21.1.3 - I needed something quick - and this behaves well. System Monitor creates no load and the VM idles around 3% CPU load.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: A responsive live desktop 21.04 image produces a slow VM image

TH: อิมเมจเดสก์ท็อปสด 21.04 ที่ตอบสนองสร้างอิมเมจ VM ที่ช้า

RO: O imagine desktop live 21.04 receptivă produce o imagine VM lentă

RU: Отзывчивый образ живого рабочего стола 21.04 создает медленный образ виртуальной машины.

VI: Hình ảnh 21.04 trên máy tính để bàn trực tiếp đáp ứng tạo ra hình ảnh VM chậm

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