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-<table class="head">
- <tr>
- <td class="head-ltitle">EST(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">EST(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">est</code> &#x2014; <span class="Nd">Enhanced
- Speedstep Technology</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this capability into your kernel place the following
- line in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device cpufreq</code></div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">est</code> interface provides support for the
- Intel Enhanced Speedstep Technology.</p>
-<p class="Pp">Note that <code class="Nm">est</code> capabilities are
- automatically loaded by the <a class="Xr">cpufreq(4)</a> driver.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
- TUNABLES</a></h1>
-<p class="Pp">The <code class="Nm">est</code> interface is intended to allow
- <a class="Xr">cpufreq(4)</a> to access and implement Intel Enhanced
- SpeedStep Technology via <a class="Xr">acpi(4)</a> and the acpi_perf
- interface accessors. If the default settings are not optimal, the following
- sysctls can be used to modify or monitor <code class="Nm">est</code>
- behavior.</p>
-<dl class="Bl-tag">
- <dt>hw.est.msr_info</dt>
- <dd>Attempt to infer information from direct probing of the msr. Should only
- be used in diagnostic cases. (default 0)</dd>
- <dt>hw.est.strict</dt>
- <dd>Validate frequency requested is accepted by the CPU when set. It appears
- that this will only work on single core cpus. (default 0)</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<p class="Pp">The following <a class="Xr">sysctl(8)</a> values are available</p>
-<dl class="Bl-tag">
- <dt id="dev.est._d._desc"><var class="Va">dev.est.%d.%desc</var></dt>
- <dd>Description of support, almost always Enhanced SpeedStep Frequency
- Control.</dd>
- <dt>dev.est.0.%desc: Enhanced SpeedStep Frequency Control</dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt id="dev.est._d._driver"><var class="Va">dev.est.%d.%driver</var></dt>
- <dd>Driver in use, always est.</dd>
- <dt>dev.est.0.%driver: est</dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt id="dev.est._d._parent"><var class="Va">dev.est.%d.%parent</var></dt>
- <dd>The CPU that is exposing these frequencies. For example
- <var class="Va">cpu0</var>.</dd>
- <dt>dev.est.0.%parent: cpu0</dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt id="dev.est._d.freq_settings"><var class="Va">dev.est.%d.freq_settings</var>.</dt>
- <dd>The valid frequencies that are allowed by this CPU and their step
- values.</dd>
- <dt>dev.est.0.freq_settings: 2201/45000 2200/45000 2000/39581 1900/37387</dt>
- <dd>1800/34806 1700/32703 1600/30227 1500/28212 1400/25828 1300/23900
- 1200/21613 1100/19775 1000/17582 900/15437 800/13723</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
-<dl class="Bl-diag">
- <dt>est%d: &lt;Enhanced SpeedStep Frequency Control&gt; on cpu%d</dt>
- <dd>
- <p class="Pp">Indicates normal startup of this interface.</p>
- </dd>
- <dt>est: CPU supports Enhanced Speedstep, but is not recognized.</dt>
- <dd></dd>
- <dt>est: cpu_vendor GenuineIntel, msr 471c471c0600471c</dt>
- <dd></dd>
- <dt>device_attach: est%d attach returned 6</dt>
- <dd>
- <p class="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.</p>
- </dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="COMPATIBILITY"><a class="permalink" href="#COMPATIBILITY">COMPATIBILITY</a></h1>
-<p class="Pp"><code class="Nm">est</code> is only found on supported Intel
- CPUs.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">cpufreq(4)</a></p>
-<p class="Pp"><cite class="Rs"><span class="RsT">Intel 64 and IA-32
- Architectures Software Developer Manuals</span>,
- <a class="RsU" href="http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html">http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html</a>.</cite></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This manual page was written by <span class="An">Sean Bruno</span>
- &lt;<a class="Mt" href="mailto:sbruno@FreeBSD.org">sbruno@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">April 21, 2020</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>