VBoxSVC.exe 100% CPU utilization with USB audio

[ndousis]

Hello,

In VirtualBox 2.1 and 2.2, VBoxSVC.exe uses 100% of 1 CPU core. I'm also using an external USB audio controller, which seems to be correlated with my problem. I read here (​http://forums.virtualbox.org/viewtopic.php?p=23861) that 100% CPU utilization may result when another program using sound is running when a VM is started.

Configuration:

• Intel Core 2 Duo
• VirtualBox 2.2.2 r46594 win.amd64
• host: Windows Vista 64-bit Home Premium SP1
• guests:
  • 32-bit Windows XP Pro SP3
  • 32-bit Ubuntu 8.10
• C-Media CM106 USB 3D audio controller (Toshiba Dynadock)

Matrix of scenarios that I've tested:

scenario	guest VM	USB audio	VBoxSVC.exe
1	on (WinXP or Ubuntu)	on	100% CPU
2	on (WinXP or Ubuntu)	off	normal
3	off	on or off	normal

A typical scenario is the following: USB audio is active; I start VirtualBox and power on my virtual machine (WinXP), and VBoxSVC.exe is running normally. As soon as I open the Zune player or go to Pandora.com, VBoxSVC.exe starts using a full CPU core, and will not stop, even after I exit my music player.

I'm using a Toshiba Dynadock docking adapter which has the USB audio chip. It seems that this VBoxSVC.exe issue disappears when my PC is not docked to the Dynadock.