Having it is supposed to improve performance. If you take two identical
machines, and enable swap on one but not the other, the first machine should
have better performance: it can cache the FS more effectively.
Now, if you have INSANE amounts of RAM (i.e. enough to have everything
running in RAM *AND* every file you access cached) the swap will make no
difference at all. Under any other circumstances, it should make things
better.
James.
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