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SubjectRe: [PATCH] TCP Zero Copy for mmapped files
> It might be a bit difficult to convert all applications to
> sendfile. Especially those for which you don't have the
> source code.

And the list of applications which do

sock = socket(...);
map = mmap(...);
write(sock, map, bytes);

are? There are not very many that I know of and if you look carefully
at the bandwidth graphs in LMbench you'll see why. There is a cross
over point where mmap becomes cheaper but it used to be around 16-64K.
I don't know what it is now, I doubt it's moved much. I can check if
you really want.
Larry McVoy lm at
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