Oracle ASMM - Are specific values ignored?
These are minimum values for those components.

http://docs.oracle.com/cd/E18283_01/server.112/e16638/memory.htm#i58728

"If these automatically tuned memory pools had been set to nonzero values, those values are used as minimum levels by Automatic Shared Memory Management. You would set minimum values if an application component needs a minimum amount of memory to function properly."