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Debian 10 vs CentOS 7 (both as VM under Fedora 32 KVM)

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cchinicz:
Hi,

I'm running Fedora 32 on my host (32GB RAM) and I have two VMs under KVM: Debian 10 and CentOS 7, both with 4GB RAM and 4 vCPUs.

With Debian, even the cursor moves with a delay when I move the mouse and all applications seems to be slower than usual. With CentOS it's just like on the host, I cannot perceive any difference in the user experience.

Any idea why Debian port does not seem to run "natively" while CentOS runs just ok? Is it because some "better" integration between host (which is Fedora) and CentOS? Shouldn't KVM see any guest the same way?

Appreciate any feed-back.

Thanks

MPC7500:
Which Debian image do you use?

cchinicz:
debian-10.4.0-ppc64el-xfce-CD-1

pocock:
If you connect to the Debian VM with SSH, how is the performance of the command line?

Can you try to use X forwarding over SSH to see how one of the apps in the Debian VM behaves when its window is on the Fedora host X display?

Have you checked journalctl and the X server log in the Debian VM?

Which X server process in each case (Fedora host, CentOS and Debian)?

When you write "slower", do you mean the GUI is slow but applications are running at expected speed?  Or the applications actually run slowly when you do something with no visual output, e.g. zipping a large file is the same speed in every VM and host?

cchinicz:
Hi,

I use both VMs through the GUI, I'm just a regular desktop user.

Regarding slowness, your question kind of answer the issue: the slowness is related to the GUI and not the applications themselves. I've tried them both again, paying attention to application start time and responsiveness and they seem to be ok and similar (actually, Firefox starts much faster on Debian than on CentOS). The issue is just this sluggishness of the cursor when I move the mouse around the screen on the Debian VM.

Maybe it's something related to how these VMs connect to the display? By the way, I'm using both VMs at 1920x1080.

Regards

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