streams I/O?

["Michael B. Rash" <mbr@math.umd.edu>]

In the new O'Reilly kernel book (which I have not finished yet so forgive 
me if this is explained later in the book but looking through the index
seems to indicate that streams is mentioned only once in the entire book),
it says that the streams I/O subsystem has been rejected for Linux because
"of the implied performance penalty".  Can anyone elaborate on this 
statement and/or point me to a source of more information?  What is the 
implied performance penalty associated with the streams subsystem?  What
is the analog of streams for Linux (or is there one)?

Thanks,

--Mike

Michael B. Rash
http://www.math.umd.edu/~mbr

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