I was using VirtualBox in Fedora and Vista but it happened to use all CPU resources in guest machine and the VM seems very slow. You can observed this problem by opening the task manager and see the CPU utilization at 100%, and core cpu usage is around 90%.
I searched about this problem but found only the questions and no useful answer. I even tried the VirtualBox 3.0 beta1 which supports SMP in VM but ended up facing blue screen of Vista guest. Seems there is no solution.
I just remebered VirtualBox said its software virtualization is better than Intel VT-x, should I try to disable VT technology? I uncheck the default setting of VT and reinstalled the guest system. All things goes smoothly!
But unfortunately VirtualBox seems slow to me and I will try KVM instead.
作者：april1985
原文链接：http://www.april1985.com/2009/06/23/fix-virtualbox-100-cpu-usage/
《-= April 1985 =-》版权所有，转载时必须以链接形式注明作者和原始出处及本声明。
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zu1000
October 6th, 2009
Maybe it is helpful to check document along with VirtualBox. There is a hint for hosting Linux Guest but having 100% usage problem. I remember it is about some frequency problem.