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Oracle Solaris Tunable Parameters Reference Manual |
1. Overview of Oracle Solaris System Tuning
2. Oracle Solaris Kernel Tunable Parameters
Where to Find Tunable Parameter Information
General Kernel and Memory Parameters
fsflush and Related Parameters
General File System Parameters
sun4u or sun4v Specific Parameters
Solaris Volume Manager Parameters
4. Internet Protocol Suite Tunable Parameters
5. Network Cache and Accelerator Tunable Parameters
A. Tunable Parameters Change History
Swapping in the Solaris OS is accomplished by the swapfs pseudo file system. The combination of space on swap devices and physical memory is treated as the pool of space available to support the system for maintaining backing store for anonymous memory. The system attempts to allocate space from disk devices first, and then uses physical memory as backing store. When swapfs is forced to use system memory for backing store, limits are enforced to ensure that the system does not deadlock because of excessive consumption by swapfs.
Defines the amount of system memory that is reserved for use by system (UID = 0) processes.
Unsigned long
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.
Pages
No
None
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.
Unstable
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.
Unsigned long
The larger of 2 Mbytes and 1/8th of physical memory
1 to amount of physical memory
Pages
No
None
When processes are failing because of an inability to obtain swap space, yet the system has memory available.
Unstable
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