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If you do have hardware extensions for virtualization optimization in your CPU, you're probably missing out on performance with Xen by using paravirt. System c
by cthalupa 12y ago
If you do have hardware extensions for virtualization optimization in your CPU, you're probably missing out on performance with Xen by using paravirt.
System calls and memory access are slower in PV than HVM (See: Problems introduced with paravirt when x86_64 removed two of the protection rings from CPU architecture) , and PV-on-HVM drivers for block/network devices get you PV level performance.