7 is the default for the current kitchen.
Pagepool is a cache for executing programs (the ones that are actually running). Think of it as additional memory for your running programs.
The larger pagepool is, the more crap you can have actively running. The smaller pagepool is, the more storage memory you have (storage is the area where programs are installed).
The general idea is to make it as small as you can without having any problems (slowness or crashing), because too big is a waste of valuable storage memory. Unfortunately, that magic sweet spot is dependent on how you use your PPC. If you have tons of storage space, feel free to use some of it as pagepool.
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Grammar: The difference between knowing your shit and knowing you're shit.
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