This is the maximum number of pages of dynamic system memory.
Value
Default: 0 (Autoconfigured if set to 0)
32-bit Range: 0x2000 - 0x20000
64-bit Range: 0x2000 - 0x10000000
When to Change
Increase this parameter correspondingly when maxdmasz is increased, or when you install a kernel driver that performs a lot of dynamic memory allocation.