Zero-copy networking

In many performance-oriented settings, the number of times that data is copied puts an upper limit on how fast things can go. As a result, zero-copy algorithms have long been of interest, even though the benefits achieved in practice tend to be disappointing. Networking is often performance-sensitive and is definitely dominated by the copying of data, so an interest in zero-copy algorithms in networking comes naturally. A set of patches under review makes that capability available, in some settings at least.

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