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1<?xml version="1.0" encoding="UTF-8"?> 1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 2<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
3<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/gentoo-amd64-faq.xml,v 1.34 2009/06/13 07:38:31 nightmorph Exp $ --> 3<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/gentoo-amd64-faq.xml,v 1.35 2009/06/14 22:55:17 nightmorph Exp $ -->
4 4
5<guide link="/doc/en/gentoo-amd64-faq.xml"> 5<guide link="/doc/en/gentoo-amd64-faq.xml">
6<title>Gentoo Linux/AMD64 Frequently Asked Questions</title> 6<title>Gentoo Linux/AMD64 Frequently Asked Questions</title>
7 7
8<author title="Editor"> 8<author title="Editor">
27 27
28<!-- The content of this document is licensed under the CC-BY-SA license --> 28<!-- The content of this document is licensed under the CC-BY-SA license -->
29<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> 29<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
30<license/> 30<license/>
31 31
32<version>1.25</version> 32<version>1.26</version>
33<date>2009-06-13</date> 33<date>2009-06-14</date>
34 34
35<faqindex> 35<faqindex>
36<title>Questions</title> 36<title>Questions</title>
37<section> 37<section>
38<title>Introduction to Gentoo/AMD64 FAQ</title> 38<title>Introduction to Gentoo/AMD64 FAQ</title>
222</p> 222</p>
223 223
224</body> 224</body>
225</section> 225</section>
226<section id="coolnquiet"> 226<section id="coolnquiet">
227<title>How do I use Cool'n'Quiet/PowerNow features?</title> 227<title>How do I use Cool'n'Quiet/PowerNow/SpeedStep features?</title>
228<body> 228<body>
229 229
230<p> 230<p>
231You have to compile your kernel with support for these features. You just need 231You have to compile your kernel with support for these features. You just need
232to enable the features below: 232to enable the features below:
233</p> 233</p>
234 234
235<pre caption="Kernel options for Cool'n'Quiet/PowerNow"> 235<pre caption="Kernel options for Cool'n'Quiet/PowerNow/SpeedStep">
236Power management options ---&gt; 236Power management options ---&gt;
237 [*] Power Management support 237 [*] Power Management support
238 [*] ACPI (Advanced Configuration and Power Interface) Support ---&gt;
239 &lt;*&gt; Processor
240 &lt;*&gt; Thermal Zone
238CPU Frequency scaling ---&gt; 241 CPU Frequency scaling ---&gt;
239 [*] CPU Frequency scaling 242 [*] CPU Frequency scaling
240 [*] CPU frequency table helpers 243 Default CPUFreq governor (ondemand) ---&gt;
244 -*- 'performance' governor
245 &lt;*&gt; 'userspace' governor for userspace frequency scaling
246 -*- 'ondemand' cpufreq policy governor
247 &lt;*&gt; ACPI Processor P-States driver
241 [*] AMD Opteron/Athlon64 PowerNow! 248 &lt;*&gt; AMD Opteron/Athlon64 PowerNow!
249-*- CPU idle PM support
242</pre> 250</pre>
243 251
244<p> 252<p>
245Then <c>emerge cpudyn</c> and edit <path>/etc/conf.d/cpudyn</path> with your 253Then <c>emerge cpufrequtils</c> and edit <path>/etc/conf.d/cpufrequtils</path>
246favorite editor. 254with your favorite editor.
247</p> 255</p>
248 256
249<pre caption="Example of /etc/conf.d/cpudyn"> 257<pre caption="Example of /etc/conf.d/cpufrequtils">
250INTERVAL=1 258# Options when starting cpufreq (given to the 'cpufreq-set' program)
251CPU_UP=0.5 259START_OPTS="--governor ondemand"
252CPU_DOWN=0.9 260
253THROTTLING_LOW=7 261# Options when stopping cpufreq (given to the 'cpufreq-set' program)
254CPUFREQ_25="/sys/devices/system/cpu/cpu0/cpufreq /sysfs/devices/system/cpu/cpu0/cpufreq" 262STOP_OPTS="--governor performance"
255CPUFREQ_ACPI="/proc/acpi/processor/CPU0/throttling"
256</pre> 263</pre>
257 264
258<p> 265<p>
259Now you only have to run <c>rc-update add cpudyn default</c> to make sure it is 266Now you only have to run <c>rc-update add cpufrequtils boot</c> to make sure it is
260started every time you boot. 267started every time you boot.
261</p> 268</p>
262 269
263<note> 270<note>
264You may want to read the <uri 271You may want to read the <uri

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