Installation guide

rt-preempt-opt = 0
cpu_enable_mask = 18446744073709551615
cpu-enable-mask = 18446744073709551615
msgbuf_size = 4096
message-buffer-size = 4096
dump-sp-threshold = 4096
lite-system = 0
The /sbin/sysconfig −q command lists all subsystem attributes and
their values. Some attributes are configurable with the /sbin/sysconfig
−r command. For information about which attributes are configurable, see
System Configuration and Tuning.
5.3.6.2 Identifying Dynamic Subsystem Attributes
You can identify which of a subsystem’s attributes are dynamic by using
the /sbin/sysconfig −Q command:
# /sbin/sysconfig -Q max-vnodes
vfs:
max-vnodes - type=INT op=CRQ min_val=0 max_val=2147483647
This example shows using the −Q flag to get information about the
max-vnodes attribute of the vfs subsystem. The max-vnodes attribute
has the integer datatype, a minimum value of zero (0), and a maximum
value of 2147483647. The op field indicates the operations that can be
performed on the max-vnodes attribute. The following list describes the
values that can appear in this field:
• C – The attribute can be modified when the subsystem is initially
loaded.
• R – The attribute can be modified while the subsystem is running.
• Q – The attribute can be queried.
5.3.6.3 Modifying Dynamic Subsystem Attributes at Run Time
You can modify the value of an attribute at run time by issuing the
/sbin/sysconfig −r command. The modification you make with this
command persists until the next time the system is rebooted. When the
system reboots, any changes made with the /sbin/sysconfig −r
command are lost because the new value is not stored. The −r flag to the
/sbin/sysconfig command is useful for testing a new subsystem
attribute value. If the new value causes the system to perform as expected,
you can later store it in the subsystem attribute database as described in
Section 5.3.8.
When you use the /sbin/sysconfig −r command you specify the
attribute, its new value, and the subsystem name on the command line.
Configuring the Kernel 5–11