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I am using Virtualbox to virtualise a Windows server on my Debian box. My computer neither has VT nor AMD Virtualization technology. When I look with top the virtualbox process never goes over 100% cpu usage. But I have 4 cores, so the maximum cpu usage would be 400%. Is there a possibility to increase the limit for the cpu usage of the Virtualbox process to over 100%?

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Did you assign more than one virtual CPU to your Windows server guest? –  Goyuix Sep 24 '12 at 14:35
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migrated from stackoverflow.com Sep 25 '12 at 9:10

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"...so the maximum cpu usage would be 400%"

False. 100 = all the cores on max. If only one core would be used, the load would be 25%.

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