Manual Pages  — SYSCTL

The information available from sysctl consists of integers, strings, and opaque types. The sysctl utility only knows about a couple of opaque types, and will resort to hexdumps for the rest. The opaque information is much more useful if retrieved by special purpose programs such as ps(1), systat(1), and netstat(1).

Some of the variables which cannot be modified during normal system operation can be initialized via loader(8) tunables. This can for example be done by setting them in loader.conf(5). Please refer to loader.conf(5) for more information on which tunables are available and how to set them.

The string and integer information is summarized below. For a detailed description of these variable see sysctl(3).

The changeable column indicates whether a process with appropriate privilege can change the value. String and integer values can be set using sysctl.

Name Ta Type	Changeable
kern.ostype Ta string	no
kern.osrelease Ta string	no
kern.osrevision Ta integer	no
kern.version Ta string	no
kern.maxvnodes Ta integer	yes
kern.maxproc Ta integer	no
kern.maxprocperuid Ta integer	yes
kern.maxfiles Ta integer	yes
kern.maxfilesperproc Ta integer	yes
kern.argmax Ta integer	no
kern.securelevel Ta integer	raise only
kern.hostname Ta string	yes
kern.hostid Ta integer	yes
kern.clockrate Ta struct	no
kern.posix1version Ta integer	no
kern.ngroups Ta integer	no
kern.job_control Ta integer	no
kern.saved_ids Ta integer	no
kern.boottime Ta struct	no
kern.domainname Ta string	yes
kern.filedelay Ta integer	yes
kern.dirdelay Ta integer	yes
kern.metadelay Ta integer	yes
kern.osreldate Ta integer	no
kern.bootfile Ta string	yes
kern.corefile Ta string	yes
kern.logsigexit Ta integer	yes
security.bsd.suser_enabled Ta integer	yes
security.bsd.see_other_uids Ta integer	yes
security.bsd.unprivileged_proc_debug Ta integer	yes
security.bsd.unprivileged_read_msgbuf Ta integer	yes
vm.loadavg Ta struct	no
hw.machine Ta string	no
hw.model Ta string	no
hw.ncpu Ta integer	no
hw.byteorder Ta integer	no
hw.physmem Ta integer	no
hw.usermem Ta integer	no
hw.pagesize Ta integer	no
hw.floatingpoint Ta integer	no
hw.machine_arch Ta string	no
hw.realmem Ta integer	no
machdep.adjkerntz Ta integer	yes
machdep.disable_rtc_set Ta integer	yes
machdep.guessed_bootdev Ta string	no
user.cs_path Ta string	no
user.bc_base_max Ta integer	no
user.bc_dim_max Ta integer	no
user.bc_scale_max Ta integer	no
user.bc_string_max Ta integer	no
user.coll_weights_max Ta integer	no
user.expr_nest_max Ta integer	no
user.line_max Ta integer	no
user.re_dup_max Ta integer	no
user.posix2_version Ta integer	no
user.posix2_c_bind Ta integer	no
user.posix2_c_dev Ta integer	no
user.posix2_char_term Ta integer	no
user.posix2_fort_dev Ta integer	no
user.posix2_fort_run Ta integer	no
user.posix2_localedef Ta integer	no
user.posix2_sw_dev Ta integer	no
user.posix2_upe Ta integer	no
user.stream_max Ta integer	no
user.tzname_max Ta integer	no