settune.2 (2010 09)

settune(2) settune(2)

WARNINGS

It is possible to seriously degrade system performance, or even render a system unbootable, with incorrect

tunable settings. Use care when setting tunable values. Always have a known working kernel

conﬁguration saved as a backup; if the system fails to boot after a tunable change, boot from that backup

kernel conﬁguration. Keep good records of all tunable changes so that they can be reversed if they

degrade system performance. Tunable changes made with

settune() are automatically logged to

sys-

log.

If the tunable being changed through

settune()

is used in expressions that set the values of other tun-

ables, those expressions will not be re-evaluated and those tunable values will not be updated. Note that

this behavior may change in future releases of HP-UX. If expression evaluation is desired, use

kctune() to set tunable values.

Changes to parameter values made with

settune() may not remain effective across reboots. Note that

this behavior may change in future releases of HP-UX. If persistence across reboots is desired, use

kctune() to set tunable values.

AUTHOR

settune() was developed by Hewlett-Packard Company.