[kde] [Bug 481374] New: Graphics performance in QEMU/KVM guest with virGL is bad (Qt 6.7)

[Rune]

https://bugs.kde.org/show_bug.cgi?id=481374

            Bug ID: 481374
           Summary: Graphics performance in QEMU/KVM guest with virGL is
                    bad (Qt 6.7)
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: rune.fritzsche at web.de
  Target Milestone: ---

In a VM using QEMU/KVM, Spice and virGL, graphics performance is very bad with
Plasma 6 RC 2 installed. This was tested using Arch Linux - without the
KDE-unstable Repo enabled, performance is fine (around 120FPS in glxgears);
with the repo enabled and thus Plasma 6 RC 2 installed, graphics performance is
very bad (20FPS in glxgears). This is very evident in desktop use, not just
with 3D-applications.


STEPS TO REPRODUCE
1. Install an Arch Linux guest in a QEMU/KVM VM
2. Enable virGL for the guest

OBSERVED RESULT
Bad graphics performance

EXPECTED RESULT
Good graphics performance

SOFTWARE/OS VERSIONS
Linux: 6.7.4-arch1-1
KDE Plasma Version: 5.93.0 
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0

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