svn commit: r237245 - head/share/man/man4
Sean Bruno
sbruno at FreeBSD.org
Mon Jun 18 23:18:50 UTC 2012
Author: sbruno
Date: Mon Jun 18 23:18:49 2012
New Revision: 237245
URL: http://svn.freebsd.org/changeset/base/237245
Log:
Document support for Intel Enhanced Speedstep Tech interface
of cpufreq(4) via a new man page est(4)
Document the two exposed tuneables of est(4).
I'd appreciate more reviews of content if possible. I gleaned
the information contained herein from sys/x86/cpufreq/est.c and
the Intel reference documentation
Reviewed by: wblock hrs gjb
MFC after: 2 weeks
Added:
head/share/man/man4/est.4 (contents, props changed)
Modified:
head/share/man/man4/Makefile
Modified: head/share/man/man4/Makefile
==============================================================================
--- head/share/man/man4/Makefile Mon Jun 18 22:17:28 2012 (r237244)
+++ head/share/man/man4/Makefile Mon Jun 18 23:18:49 2012 (r237245)
@@ -116,6 +116,7 @@ MAN= aac.4 \
enc.4 \
epair.4 \
esp.4 \
+ est.4 \
et.4 \
eventtimers.4 \
exca.4 \
Added: head/share/man/man4/est.4
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/man/man4/est.4 Mon Jun 18 23:18:49 2012 (r237245)
@@ -0,0 +1,100 @@
+.\"
+.\" Copyright (c) 2012 Sean Bruno <sbruno at freebsd.org>
+.\" All rights reserved.
+.\"
+.\" 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 AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 12, 2012
+.Dt EST 4
+.Os
+.Sh NAME
+.Nm est
+.Nd Enhanced Speedstep Technology
+.Sh SYNOPSIS
+To compile this capability into your kernel
+place the following line in your kernel
+configuration file:
+.Bd -ragged -offset indent
+.Cd "device cpufreq"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+interface provides support for the Intel Enhanced Speedstep Technology.
+.Pp
+Note that
+.Nm
+capabilities are automatically loaded by the
+.Xr cpufreq 4
+driver.
+.Sh LOADER TUNABLES
+The
+.Nm
+interface is intended to allow
+.Xr cpufreq 4
+to access and implement Intel Enhanced SpeedStep Technology via
+.Xr acpi 4
+and the acpi_perf interface accessors.
+If the default settings are not optimal, the following sysctls can be
+used to modify or monitor
+.Nm
+behavior.
+.Bl -tag -width indent
+.It hw.est.msr_info
+Attempt to infer information from direct probing of the msr.
+Should only be used in diagnostic cases
+.Pq default 0
+.It hw.est.strict
+Do not allow different cpus to be set to different frequencies.
+It appears that this will only work on i386 systems
+.Pq default 0
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "est%d: <Enhanced SpeedStep Frequency Control> on cpu%d"
+.Pp
+Indicates normal startup of this interface.
+.It "est: CPU supports Enhanced Speedstep, but is not recognized."
+.It "est: cpu_vendor GenuineIntel, msr 471c471c0600471c"
+.It "device_attach: est%d attach returned 6"
+.Pp
+Indicates all attempts to attach to this interface have failed.
+This usually indicates an improper BIOS setting restricting O/S
+control of the CPU speeds.
+Consult your BIOS documentation for more details.
+.El
+.Sh COMPATIBILITY
+.Nm
+is only found on supported Intel CPUs.
+.Sh SEE ALSO
+.Xr cpufreq 4
+.Sh SUPPORT
+For general information and support,
+go to the Intel 64 and IA-32 Architectures Software Developer
+Manuals site.
+.Pa http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html
+.Sh AUTHORS
+.Pp
+This manual page was written by
+.An Sean Bruno Aq sbruno at FreeBSD.org .
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