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Windows xp in virtualbox on ubuntu =100% cpu

PostPosted: 27. Jun 2008, 06:56
by greekman12
Hi,

I've set up windows xp in a vm on Ubuntu 8.04. The install works, but as soon a s windows boots the CPU utilization goes to 100% and stays there. I've tried disabling usb, cd-rom options....any ideas what I can do to prevent this?

Thanks.

PostPosted: 27. Jun 2008, 11:06
by AlGaN
same with me. I installed VB 1.6.2 recently and started a Windows XP image created with 1.5.6, as soon as Windows starts, CPU load reaches 100% forever.

Some users said this is due to crappy ACPI of windows, but I had activated ACPI support in 1.5.6 without any problems... :(

I'd be looking forward to a fix/workaround for this major issue...

Thanks,
AlGaN

Windows xp in virtualbox on ubuntu =100% cpu --- SOLVED

PostPosted: 27. Jun 2008, 22:36
by greekman12
I've found a solution for my laptop.

I re-created the VM and disabled acpi, then re-installed windows. Now the cpu utilization is way down. Granted, I have one core active in the vm, but it's much more responsive.





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PostPosted: 30. Jun 2008, 04:35
by kyboren
AlGaN wrote:same with me. I installed VB 1.6.2 recently and started a Windows XP image created with 1.5.6, as soon as Windows starts, CPU load reaches 100% forever.

Some users said this is due to crappy ACPI of windows, but I had activated ACPI support in 1.5.6 without any problems... :(

I'd be looking forward to a fix/workaround for this major issue...

Thanks,
AlGaN

The problem is not activating support in the VM manager -- you need to swap out the Windows kernel for one that doesn't use ACPI.

Your CPU will, by default, prompt Windows to load the ACPI-enabled SMP kernel. So when you switch to having Windows virtualized, this kernel remains and uses some ACPI registers that have severe virtualzation penalties (it talks to the BIOS). The solution is to force Windows to stop doing that. You can do this by going to Device Manager (right click on My Computer -> Hardware -> Device Manager), expanding 'Comptuer', right-clicking 'ACPI Multiprocessor PC', select 'Update Driver...', choose manual installation, from a list, and select 'Standard PC'.

Then you're set :)