HP-UX Reference (11i v2 07/12) - 2 System Calls (vol 5)

settune(2) settune(2)

[EPERM] The caller does not have the

SYSATTR privilege.

[EINVAL] The speciﬁed value is not within the acceptable range for the speciﬁed parameter.

[EBUSY] The value of the parameter could not be changed immediately.

[ENOTSUP] The speciﬁed parameter cannot be changed without rebooting the kernel and

STF_NOPENDING ﬂag was speciﬁed.

[EIO] The Kernel Registry Service was unavailable or encountered an error.

[ENOMEM] Insufﬁcient memory to accommodate the new parameter value.

WARNINGS

The caller must have the SYSATTR privilege to use this call.

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

syslog.)

If the tunable being changed through settune(2) is used in expressions that set the values of other tunables,

those expressions will not be re-evaluated and those tunable values will not be updated. If expression

evaluation is desired, use kctune(1M) to set tunable values.

AUTHOR

settune() was developed by Hewlett-Packard Company.