How to change persistingL2CacheMaxSize?

Hello everyone, I encountered some issues while trying to use the Persisting feature of L2cache. The a100 machine has a 40MB L2 cache, but I found through persitingL2CacheMaxSize that the maximum available persitingL2Cache for this machine is 25MB. Is there any way I can change this value to make it larger? For example, 30MBor35MB.