It was just read-write vs sendfile vs map-write-munmap (vs the "perfect"
numbers of a just write). All the cases require the same open-close code,
so I didn't think that was worth testing because it shouldn't change
relative timings, just add constant overhead.
It _would_ perhaps be interesting to see if it is worthwhile to change the
sendfile() interface to do the open-close inside sendfile, and pass
sendfile a filename. The reason I didn't do that is that I suspect that
any real use of sendfile() would have to open the file for other reasons
anyway (to do a "stat" on it to get modification times, for example) and
in that case it would be a bad interface to require us to do another name
lookup.
Linus
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