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That as maybe - it might be worth putting a suggested
maximum in the docs.  However I would say that given that an
IPv6 packet could be as large as 2Gig, it's not unreasonable
to ask for a packet as large as 1 Gig.  Wether the problem
is in glibc or python I don't know, although it seems that
asking for a buffer of 1.3 Gig in size, and passing that to
recv() would be odd behaviour on a current system in C given
that most systems couldn't allocate that much memory to a
buffer ;).  I have written fairly extensive socket code in
C/C++ before, and I never used anything larger than 65536
for the obvious reason that you can't receive anything
bigger than that in IPv4 (and most NICs can't handle
anything that big either).  I figured it would be
interesting to see what happened :).  I have a penchant for
being the only person in history to do quite a few things
apparently!