13-CURRENT: several GB swap being used despite plenty of free RAM

[Wojciech Puchar]

>
> The above settings are about process level swapping, i.e. the
> deactivation of whole processes, they don't control swapping in the
> sense of paging out to the swap device.
>
> By default process swapping is only used under extreme memory shortage,
> setting vm.swap_idle_enabled=1 allows idle processes to be deactivated.
> It's only really intended for some special cases like login servers,
> which tend to have a lot of inactive shell and editor processes.
>

and my servers that have LOTS of httpd servers each for one webpage which 
are usually rarely visited.

> Changing those setting wont reduce swap usage, they may increase
> it.
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