Performance issues on Vista when sound enabled in guest

[TheVegaWarrior]

Hi,


I'm using Vista on my host with VirtualBox 2.2.2 and Windows XP in several guests. When I enable the sound in the guests (Windows DirectSound / ICH AC97), then I get performance issues. I have been able to see 2 symptoms. The first one is that audiodg process starts consuming CPU (around 15% on my dual-core AMD Turion X2). The second one, seen with ProcessExplorer, from SysInternals, but not all the time, is that a thread named "MSVCR71.dll!endthreadex+0x31" is consuming most of the guest CPu power. At the same time, the guest is very. I have not been able to confirm that the thread was related to the sound, but performances are definitely must poorer when sound is enabled.

My sound card driver is a Realtek High Definition Audio, 6.0.1.5704. As workaround, I have tried to kill audiodg, but it leads to an immediate BSOD. I can suspend audiodg with Process Explorer, which improves performances, but can cause problems if I stop the VM (or if it crashes) before I resume the audiodg.

Has someone experienced something similar ? Do you have any suggestions on workarounds ? Otherwise, I will probably switch the sound off, which might be a burden if I have to restart a guest, just to reenable the sound...


Kind regards,


Vincent