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What puzzles me is that noone mations the works in the Linux Documentation Project where a number of documents give in depth description of swap space issues.

At least one gives a rather in depth description of the issue, the Multi Disk HOWTO which is very much about tuning in general. It is way to big to quote here so I' rather suggest the interested readers look at the following chapters listed below (straight from the Multi Disk HOWTO homepage):

• disk drives and speed
• File System Features which even starts off discussing swap. Pay special attention to interleaving issues.
• Terms which gives more info on speed limitations and what speed really is
• Physical track positioningan old but still good technique
• Disk layout for general layout issues
• The need for swap
• An example setting using 4 interleaved swap partitions.
• Single drive swap positioning optimisation

Note that the swap partiotn limit in old kernels depends on the architecture of the processor, namely if it is a 32- or 64-bits processor.

If you have any comments to the HOWTO I hope you can take direct contact with the author so more people can benefit from your insight.