>"Zero copy" usually means "zero unnecessary copies"; but
>what someone thinks of as "necessary" is really based on
>their bias towards an existing implementation.

   "zero copy" these days has come to mean no copies that involve
the CPU. In my experiance, raw memory bandwidth to DMA packets
to/from main memory is not the bottleneck on modern hardware.

-DG

David Greenman
Co-founder, The FreeBSD Project - http://www.freebsd.org
President, TeraSolutions, Inc. - http://www.terasolutions.com
President, Download Technologies, Inc. - http://www.downloadtech.com
Pave the road of life with opportunities.

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