Defines the desired amount of physical memory to be kept free for the rest of the system. Attempts to reserve memory for use as swap space by any process that causes the system's perception of available memory to fall below this value are rejected. Pages reserved in this manner can only be used for locked-down allocations by the kernel or by user-level processes.
The larger of 2 MB and 12.5% of physical memory
1 to amount of physical memory
Consider reducing this parameter value when processes are failing because of an inability to obtain swap space, yet the system has memory available. For example, change this value to use no more than 6.25% of system memory, but do not reduce it below 5% of system memory.
On SPARC systems, the value should be at least 2 times the value of tsb_alloc_hiwater_factor. For more information, see tsb_alloc_hiwater_factor.