TMPFS Parameters

tmpfs:tmpfs_maxkmem

Description

Defines the maximum amount of kernel memory that TMPFS can use for its data structures (tmpnodes and directory entries).

Data Type

Unsigned long

Default

One page or 4 percent of physical memory, whichever is greater.

Range

Number of bytes in one page (8192 for sun4u or sun4v systems, 4096 for all other systems) to 25 percent of the available kernel memory at the time TMPFS was first used.

Units

Bytes

Dynamic?

Yes

Validation

None

When to Change

Increase if the following message is displayed on the console or written in the messages file:

tmp_memalloc: tmpfs over memory limit

The current amount of memory used by TMPFS for its data structures is held in the tmp_kmemspace field. This field can be examined with a kernel debugger.

Commitment Level

Unstable

tmpfs:tmpfs_minfree

Description

Defines the minimum amount of swap space that TMPFS leaves for the rest of the system.

Data Type

Signed long

Default

512

Range

0 to maximum swap space size

Units

Pages

Dynamic?

Yes

Validation

None

When to Change

To maintain a reasonable amount of swap space on systems with large amounts of TMPFS usage, you can increase this number. The limit has been reached when the console or messages file displays the following message:

fs-name: File system full, swap space limit exceeded

Commitment Level

Unstable