I'm running Ubuntu 9.04 on a Core i7 processor, with VirtualBox 3.0.6. I created a guest machine running Windows 2000 SP4, and allocated two CPU cores to the guest. Whilst everything works fine, Conky indicates that two cores are running at 100% even when Windows is idle. Windows Task Manager shows negligible utilisation as expected. The high utilisation is also confirmed by checking the CPU core temperatures - the CPU fan also starts running fast as soon as I start the guest machine. The utilisation remains unchanged if I run a CPU-intensive application on the guest.
Has anyone else observed this?