Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. "Zero-copy" describes computer operations in which the CPU does not perform the task of copying data from one memory area to another. Zero-copy versions of operating system elements such as device drivers, file systems, and network protocol stacks greatly increase the performance of certain application programs and more efficiently utilize system resources. Performance is enhanced by allowing the CPU to move on to other tasks while data copies proceed in parallel in another part of the machine. Also, zero-copy operations reduce the number of time-consuming mode switches between user space and kernel space. System resources are utilized more efficiently since using a sophisticated CPU to perform extensive copy operations, which is a relatively simple task, is wasteful if other simpler system components can do the copying.

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