The Spice project aims to provide a complete open source solution for interaction with virtualized desktop devices.The Spice project deals with both the virtualized devices and the front-end. Interaction between front-end and back-end is done using VD-Interfaces. The VD-Interfaces (VDI) enable both ends of the solution to be easily utilized by a third-party component.
The following diagram illustrates VD-Interfaces:
Currently, the project main focus is to provide high-quality remote access to QEMU virtual machine. Seeking to help break down the barriers to virtualization adoption by overcoming traditional desktop virtualization challenges, emphasizing user experience. For this purpose, Red Hat introduced the SPICE remote computing protocol that is used for Spice client-server communication. Other components developed include QXL display device and driver, etc.
The following diagram illustrates the current Spice solution on top of QEMU.
The Spice project plans to provide additional solutions, including:
- Remote access for a physical machine
- VM front-end for local users (i.e., render on and share devices of the same physical machine)
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http://www.redhat.com/resourcelibrary/articles/rhev-desktops-spice
What is SPICE?
SPICE is an open source, adaptive remote rendering protocol used by Red Hat® Enterprise Virtualization for Desktops to connect users to their virtual desktops. Unlike first-generation remote rendering protocols, such as Remote Desktop Protocol (RDP) and Independent Computing Architecture (ICA), SPICE features a multitiered architecture designed to support today's multimedia desktop experience.
3-tier architecture
SPICE functions on a 3-tier architecture, leveraging a unique component in each tier:
- SPICE Driver: A software component that resides within each virtual desktop
- SPICE Device: A software component that resides within the Red Hat Enterprise Virtualization Hypervisor
- SPICE Client: A software component that resides on the end-point device—either a thin client or a repurposed PC—used to access each virtual desktop
Efficient graphics processing
These three components work in tandem, determining the most efficient place to process graphics, in order to provide the best possible user experience, while reducing the system load.
If the client is powerful enough, SPICE sends the graphics commands to the client and processes them at the client level, significantly decreasing the load on the server. On the other hand, if the client is not powerful enough, SPICE processes the graphics at the host level, where graphics processing is a lot less expensive from a CPU perspective.
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