Date: Thu, 14 Jun 2001 05:47:31 -0700 (PDT) From: Thierry Herbelot <thierry@herbelot.com> To: freebsd-gnats-submit@freebsd.org Subject: docs/28143: the Hz kernel config option is not documented Message-ID: <200106141247.f5EClVW14680@freefall.freebsd.org>
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>Number: 28143
>Category: docs
>Synopsis: the Hz kernel config option is not documented
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Jun 14 05:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Thierry Herbelot
>Release: FreeBSD 4.3-Release
>Organization:
>Environment:
FreeBSD pc-bsd60.XXX 4.3-RELEASE FreeBSD 4.3-RELEASE #11:
Tue Apr 24 19:14:23 CEST 2001
herbelot@pc-bsd60.XXXX:/usr/obj/usr/src/sys/station i386
>Description:
The Hz kernel config option is referenced in the ipfw(8) man page
(typically 10ms, but it is a good practice to run kernels with
``options HZ=1000'' to reduce the granularity to 1ms or less) but is
nowhere to be seen in the usual kernel config help file (aka LINT) or
in a man page (and neither in the handbook).
I am using HZ=5000 in some (around 100) PCs here, with no ill effects.
As this feature is a great win for xxBSD (for example for real-time
systems), it should be documented.
>How-To-Repeat:
>Fix:
Add a doc line in the LINT config file:
-----------------------------
options HZ=1000 # set the system clock to 1000 Hz
# (values above above 5000Hz should not be used)
-----------------------------
>Release-Note:
>Audit-Trail:
>Unformatted:
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