kctune.1m (2010 09)

k
kctune(1M) kctune(1M)
defvalue The default value of the tunable, if known. For saved configurations, the default
values of some tunables may not be known until the configuration is in use.
dynamic This field contains a y
if the tunable can be changed without a reboot, or an n
otherwise.
expr The expression used to set the value of the tunable, if any. If the tunable is set to
default, this field contains the word
Default.
flags This field contains a hexadecimal representation of the bitmask containing the
dynamic, canauto, default, auto_default, and
signed flags, among
others. See
/usr/include/sys/dyntune.h
for definitions of flag values.
Additional flag values may be defined in future releases or patches.
max The maximum value of the tunable. This is an absolute maximum; the currently
running system may not be able to support values this high. If there is no max-
imum value, this field will be omitted from the output.
min The minimum value of the tunable. This is an absolute minimum; the currently
running system may not be able to support values this low. If there is no
minimum value, this field will be omitted from the output.
module The name of the module supplying the tunable, if any; otherwise, this field will be
omitted from the output.
name The name of the tunable.
next_boot The value that will be used for the tunable at next boot, if known. The next boot
value of some tunables may not be known until the boot completes. If the value
was specified using an expression, this field contains the result of evaluating that
expression. This field is not printed for saved configurations.
next_default This field contains a y if the tunable is set to its default value at next boot, or an
n otherwise. This field is not printed for
next_expr The expression for the tunable’s value at next boot, if any. If the tunable is set to
default, this field contains the word
Default.If-c is specified, this field is
omitted from the output. saved configurations.
signed This field contains a y if the tunable values should be treated as signed integers,
or an n otherwise.
The special field name
ALL may be specified to indicate that all defined fields should be included in the
output. The output may include fields not listed in this man page. The fields will be listed in unspecified
order.
Additional fields may be added in future releases or patches.
Default Output
When kctune is called with no options, it shows all tunables associated with the kernel modules (as well
as the user-defined tunables), their current values, expressions used to compute those values, and when
changes can be made to these tunables. If there are changes that are being held for nextboot, they will be
shown as well.
On a typical system, the expression for most tunables are marked
Default meaning that the adminis-
trator is allowing the system to choose the tunable value. The changes column shows the restrictions on
when the tunable value can be changed. Tunables whose value can be changed immediately are marked
Immed. Tunables whose values are being automatically tuned by the system are marked Auto
. If the
administrator has disabled the automatic tuning by the system the tunable is marked
Imm (auto dis-
abled). The tunables which have nothing in the changes column can only be changed with a reboot.
The layout and content of the default output may change in future releases or patches of HP-UX. Scripts
or applications which need to parse the output of
kctune must use the -P option to obtain output that
can be parsed.
RETURN VALUE
kctune returns one of the following values:
0
kctune was successful. If -D was specified, this return value indicates that there are no tunable
changes being held for next boot.
4 Hewlett-Packard Company − 4 − HP-UX 11i Version 3: September 2010