2.4 kernel and 4GB+ of RAM

[Adam Shand <larry@spack.org>]

Hey all.

I'm hoping for some advice here.  I've just started a new job and one of
the things they want me to do is to build a linux farm/cluster for running
large simulation and regression tests.

Some of these tests can be up to 4GB and in time they will grow larger.
I have a limited understanding of the hardware restrictions of linux and
have had a hard time finding good answers to these questions by searching
google.  So my questions are:

 * In the new 2.4 kernels can a single process address more then 2Gb of
   RAM?  More then 4Gb of RAM?

 * Is this architecture dependent?  If so what are the differences.

 * What is the hard limit for the total amount of ram usable by a 2.4
   kernel.

If I've missed a good place to read about all this pointers would be much
appreciated as well.

Thanks,
Adam.