Ticket #6546 (closed defect: fixed)

Opened 8 years ago

Last modified 5 years ago

High CPU load when playing video in WIndows XP guest

Reported by: ezjd Owned by:
Priority: critical Component: VMM
Version: VirtualBox 3.1.6 Keywords:
Cc: Guest type: Windows
Host type: Linux

Description (last modified by frank) (diff)

Starting from VBox 3.X, I found video playback eats a lot of CPU in Windows XP guest under Linux Host (I tried Ubuntu 9.04, 9.10, 10.04).

For normal screen resolution (1024X768), full screen video playback takes ~80% of both cores of my AMD Atholon X2 64, and if in higher resolution, it will take 100% of both cores and can't get smooth video.

I tried different combination of options like 1 or 2 virtual CPU, HW/SW virtualization, with or w/o guest addon, and with or w/o 3D, 2D acceleration, but no change is noticeable. I even tried OSE version provided by Ubuntu and binary version from, but no difference.

However, guest CPU load wasn't high at ~30% so that I highly suspect it is video buffer copying issue or video driver issue.

In VBox 2.x, it was OK though only one core (or max 50% of both core) will be used while normally it was under 80% for a core and didn't see choppy video playback with high screen resolution. Unforrunately, I can't use 2.2.4 under Ubuntu 10.04 because of KLM build failure.


VBox.log.1 Download (86.4 KB) - added by ezjd 8 years ago.
log file

Change History

Changed 8 years ago by ezjd

log file

comment:1 Changed 8 years ago by ezjd

With 3.2.0, it gets improved as host CPU load drops to ~60% for both core. This makes Guest OS in usable state, but host CPU load still seems too high.

comment:2 Changed 8 years ago by frank

  • Component changed from other to VMM

comment:3 Changed 5 years ago by frank

  • Status changed from new to closed
  • Resolution set to fixed
  • Description modified (diff)

Please reopen if still relevant with VBox 4.2.6.

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