tcp sendmsg + zero copy

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Hi All,

The zero copy patches that went into the 2.4.4 kernel
(http://lwn.net/2001/0419/kernel.php3) enabled zero copy
only from the sendfile syscall.

This is weird since all the framework is there to enable zero
copy in sendmsg - by marking the user pages as COW until the
pskb is freed.

There must be a reason why it's not there (the patches
are 4 years old). can someone shed some light on this?
Was this ever tried? What am i missing?

Aviv Greenberg
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