The smaller of 4 Mbytes and 1/16th of physical memory
The minimum value is 4 Mbytes or 1/16th of physical memory, whichever is smaller, expressed as pages using the page size returned by getpagesize.
The maximum value is the number of physical memory pages. The maximum value should be no more than 10 percent of physical memory. The system does not enforce this range, other than that described in the Validation section.
Generally not necessary. Only change when recommended by a software provider, or when system processes are terminating because of an inability to obtain swap space. A much better solution is to add physical memory or additional swap devices to the system.