Ubuntu 11.10: Xen vs. KVM vs. VirtualBox
When turning the focus to cryptography from ray-tracing, KVM continued to be the fastest virtualization contender at 97% the raw speed of the system. Closely behind with the DES workload was VirtualBox and the Xen DomU instance was at just 69% the speed of bare metal.
When running the Blowfish test, VirtualBox and KVM were both fast, while the DomU guest continued in its ~30% performance penalty.
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