58 lines
2.1 KiB
Groff
58 lines
2.1 KiB
Groff
.\" $NetBSD: hz.9,v 1.6 2008/04/30 13:10:58 martin Exp $
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.\"
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.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Thomas Klausner.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 4, 2001
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.Dt HZ 9
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.Os
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.Sh NAME
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.Nm hz
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.Nd system clock frequency
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.Sh SYNOPSIS
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.In sys/kernel.h
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.Va int hz;
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.Sh DESCRIPTION
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.Nm
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specifies the number of times the
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.Xr hardclock 9
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timer ticks per second.
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.Nm
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is hardware-dependent; it can be overridden (if the machine dependent
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code supports this) by defining
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.Em HZ
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in the kernel configuration file (see
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.Xr options 4 ) .
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Only override the default value if you really know what you are
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doing.
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.Sh SEE ALSO
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.Xr options 4 ,
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.Xr callout 9 ,
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.Xr hardclock 9 ,
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.Xr microtime 9 ,
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.Xr time_second 9
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