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+.\"	$NetBSD: hz.9,v 1.9 2010/03/26 19:40:41 wiz Exp $
+.\"
+.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Thomas Klausner.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd March 25, 2010
+.Dt HZ 9
+.Os
+.Sh NAME
+.Nm hz ,
+.Nm tick ,
+.Nm tickadj ,
+.Nm stathz ,
+.Nm profhz
+.Nd system time model
+.Sh SYNOPSIS
+.In sys/kernel.h
+.Pp
+.Vt extern int hz;
+.Vt extern int tick;
+.Vt extern int tickadj;
+.Vt extern int stathz;
+.Vt extern int profhz;
+.\" XXX: .Vt extern int schedhz; ?
+.Sh DESCRIPTION
+The essential clock handling routines in
+.Nx
+are written to operate with two timers that run independently of each other.
+The main clock, running
+.Va hz
+times per second, is used to keep track of real time.
+.Pp
+In another words,
+.Va hz
+specifies the number of times the
+.Xr hardclock 9
+timer ticks per second.
+Normally
+.Xr hardclock 9
+increments time by
+.Va tick
+each time it is called.
+If the system clock has drifted,
+.Xr adjtime 2
+may be used to skew this increment based on the rate of
+.Va tickadj .
+.Pp
+The second timer is used to gather timing statistics.
+It also handles kernel and user profiling.
+If the second timer is programmable,
+it is randomized to avoid aliasing between the two clocks.
+The mean frequency of the second timer is
+.Va stathz .
+If a separate clock is not available,
+.Va stathz
+is set to
+.Va hz .
+.Pp
+If profiling is enabled, the clock normally used to drive
+.Va stathz
+may be run at a higher rate
+.Va profhz ,
+which is required to be a multiple of
+.Va stathz .
+This will give higher resolution profiling information.
+.Pp
+These system variables are also available as
+.Em struct clockinfo
+from
+.Xr sysctl 3
+and
+.Sy kern.clockrate
+from
+.Xr sysctl 8 .
+The
+.Va hz
+is hardware-dependent; it can be overridden
+(if the machine dependent code supports this) by defining
+.Dv HZ
+in the kernel configuration file (see
+.Xr options 4 ) .
+Only override the default value if you really know what you are doing.
+.Sh SEE ALSO
+.Xr adjtime 2 ,
+.Xr callout 9 ,
+.Xr hardclock 9 ,
+.Xr microtime 9 ,
+.Xr time_second 9