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LEARN ABOUT FREEBSD

est

EST(4)							   BSD Kernel Interfaces Manual 						    EST(4)

NAME

     est -- Enhanced Speedstep Technology

SYNOPSIS

     To compile this capability into your kernel place the following line in your kernel configuration file:

	   device cpufreq

DESCRIPTION

     The est interface provides support for the Intel Enhanced Speedstep Technology.

     Note that est capabilities are automatically loaded by the cpufreq(4) driver.

LOADER TUNABLES

     The est interface is intended to allow cpufreq(4) to access and implement Intel Enhanced SpeedStep Technology via 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 est behavior.

     hw.est.msr_info
	     Attempt to infer information from direct probing of the msr.  Should only be used in diagnostic cases.  (default 0)

     hw.est.strict
	     Validate frequency requested is accepted by the cpu when set.  It appears that this will only work on single core cpus.  (default 0)

SYSCTL VARIABLES

     The following sysctl(8) values are available

     dev.est.%d.desc
	     Description of support, almost always Enhanced SpeedStep Frequency Control.

     dev.est.0.%desc: Enhanced SpeedStep Frequency Control

     dev.est.%d.driver
	     Driver in use, always est.

     dev.est.0.%driver: est

     dev.est.%d.parent

     dev.est.0.%parent: cpu0
	     The cpu that is exposing these frequencies.  For example cpu0.

     dev.est.%d.freq_settings.
	     The valid frequencies that are allowed by this CPU and their step values.

     dev.est.0.freq_settings: 2201/45000 2200/45000 2000/39581 1900/37387
	     1800/34806 1700/32703 1600/30227 1500/28212 1400/25828 1300/23900 1200/21613 1100/19775 1000/17582 900/15437 800/13723

DIAGNOSTICS

     est%d: <Enhanced SpeedStep Frequency Control> on cpu%d

     Indicates normal startup of this interface.

     est: CPU supports Enhanced Speedstep, but is not recognized.
     est: cpu_vendor GenuineIntel, msr 471c471c0600471c
     device_attach: est%d attach returned 6

     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.

COMPATIBILITY

     est is only found on supported Intel CPUs.

SEE ALSO

     cpufreq(4)

     Intel 64 and IA-32 Architectures Software Developer Manuals, http://www.intel.com/content/www/us/en/processors/architectures-software-
     developer-manuals.html.

AUTHORS

     This manual page was written by Sean Bruno <sbruno@FreeBSD.org>.

BSD
								 October 18, 2012							       BSD