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[Anglade Pierre-Matthieu <anglade@gmail.com>]

Hi,
I can't tell you anythong about your error in rf calculation.
The maximum swapspace available is 4GB because it is the maximum size
of memory your OS can adress with a 32 bits adress space:
you have 2^32=4.10^9 adresses available. Then depending on the tricks
your OS is using you can have a memory limit which is 2^31 for the
whole user space or 2^31 per process. But you can hardly go further
without a 64 bit enabled OS and processor.
Your swap space on the hardrive is just made in a way to reflect this
mathematic limit. The file allocation table (FAT) is fixed for
optimisation purpose. And then is not able to handle bigger partion
than what is usable by the 32bit kernel.

Anyway your calculations won't go fast enough to be completed if your
computer is swapping even the calculation. Then 4GB is really enough.
--
Pierre-Matthieu Anglade