general VM / KMEM tunables question

[Wojciech Puchar]

>
> vm.v_free_min=8192
> vm.v_free_target=16384
> vm.v_free_reserved=8192
> vm.v_free_severe=16384
>
could you tell me what is the difference it makes and can this values as 
default make server crashing with panic on swap pager when doing lot of 
swapping?