There is no point in setting vm.kmem_size_max. Setting
vm.kmem_size is enough. vm.kmem_size_max is used for
auto-tuning of kmem size which is in this case actually

Can you explain why would you have to decrease kmem_size to
use larger ARC?
AFAIK it should be contrary to what you are saying: when
you use larger kmem_size you can also use larger arc_max.

My suggestion if you are using kmem_size of 1536M would be
to not tune arc_min and arc_max if your system isn't
panicing. If it does you should try decreasing arc_max (from
it's default value) until it doesn't.



      
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