freebehind

Description

Enables the freebehind algorithm. When this algorithm is enabled, the system bypasses the file system cache on newly read blocks when sequential I/O is detected during times of heavy memory use.

Data Type

Boolean

Default

1 (enabled)

Range

0 (disabled) or 1 (enabled)

Dynamic?

Yes

Validation

None

When to Change

The freebehind algorithm can occur too easily. If no significant sequential file system activity is expected, disabling freebehind makes sure that all files, no matter how large, will be candidates for retention in the file system page cache. For more fine-grained tuning, see smallfile.

Commitment Level

Unstable