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Para-virtualization (OS-assisted virtualization)

—The guest OS is presented with a modified hardware abstraction. This requires operating systems to be modified and ported to this particular virtualization platform. This reduces operating system compatibility, but that is a trade-off against potential increases in performance of certain CPU-bound applications that run on systems without virtualization hardware. This performance increase is achieved by hypercalls, a communication method that occurs between the guest OS and the hypervisor, but the performance advantage can vary greatly, depending on the workload. However, each guest operating system, such as Linux, needs to be modified. VMware has traditionally offered full virtualization, but aspects of para-virtualization have been offered as an option for enhanced device drivers that increase the efficiency of guest operating systems.



PC-over-IP (PCoIP)

—PCoIP was a purpose-built protocol designed by Teradici to deliver a rich desktop experience consisting of content such as application windows, Web pages, graphics, text, and streaming video and audio over both the LAN and the WAN. PCoIP recognizes the different types of content and uses different compression algorithms based on content type. PCoIP delivers multi-monitor support with up to 1920 × 1200 resolution, clear-type fonts, and 32-bit color per monitor for up to four monitors. It includes Auto Display scaling, dynamic resizing, and support of monitor pivoting. It enables multimedia redirection, USB support, support for host-based rendering of Flash, and bi-directional audio.




  

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