[plug] Too much memory

[Bernd Felsche]

I can't seem to remember which kernel tuneable allows me to reduce
the size of the buffer cache from the default.

There's 6GB of RAM on one machine which leads to unpleasantries when
they flush.

Xpen$ive # free
             total       used       free     shared    buffers     cached
Mem:       6211260    6202476       8784          0     398484    5360220
-/+ buffers/cache:     443772    5767488
Swap:      2634640     239432    2395208


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