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Optimizing Citrix® XenDesktop® for High Performance
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Full virtualization (FV) is a complete virtual emulation of the physical hardware where every feature and function of the physical hardware is made available to virtual machines including interrupts, memory access, network functions, storage, CPUs, and instruction sets.
Full virtualization was initially attractive and useful because you could run any operating system as a virtual machine. The downside is that it is very slow because the hypervisor must emulate all the physical devices in the server in order to run the VM. Some hypervisors, like XenServer, automatically turn on paravirtualization drivers when running machines in full virtualization.
In full virtualization, the underlying hardware is emulated by the hypervisor. The virtual machine is unaware of the hypervisor and the simulation taking place. For this reason, full virtualization virtual machines can be slow.

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