[FAQ?] More ram=less performance (maximum cacheable RAM)

[Luca Montecchiani <m.luca@iname.com>]

I've recently updated my K6-2 from 128 to 256mbytes (2x128 pc133 dimms)
compiling kernel take now 13 minutes instead of 9 minutes :(

Ram is so cheap and socket7 is far from the death, time for a FAQ?

Here some description from http://9-muses.com/freak/reviews/super7.shtml :
The Level2 Cache determines the board's maximum cacheable RAM. 
Boards equipped with 512k can cache up to 128MB of RAM while
those equipped with 1MB can handle up to 256MB of RAM. If you're using all
of the RAM cacheable by the the L2 cache, performance is enhanced. Once you
go above the maximum cacheable RAM, performance is lost. What this means to
you is the more cache the better. For some users, 64MB or even 128MB of RAM
is enough, but who knows, somewhere down the road, you might want to upgrade
to 256MB. It's nice to know your board can handle the extra memory without
worrying about losing performance.

More technical information can be found here :
http://www.pcguide.com/ref/mbsys/cache/char_Cacheability.htm

Patch and other info about non cacheable ram here :
http://www.keryan.org/brad/slram/

ciao,
luca
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