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1 neysx 1.1 <?xml version="1.0" encoding="UTF-8"?>
2     <!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
3 nightmorph 1.33 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/gentoo-amd64-faq.xml,v 1.32 2009/04/15 06:33:59 nightmorph Exp $ -->
4 neysx 1.1
5     <guide link="/doc/en/gentoo-amd64-faq.xml">
6     <title>Gentoo Linux/AMD64 Frequently Asked Questions</title>
7    
8     <author title="Editor">
9 neysx 1.22 <mail link="blubb@gentoo.org">Simon Stelling</mail>
10     </author>
11     <author title="Editor">
12 fox2mike 1.12 <mail link="metalgod@gentoo.org">Luis Medinas</mail>
13 neysx 1.1 </author>
14     <author title="Editor">
15     <mail link="gerrynjr@gentoo.org">Gerald J. Normandin Jr.</mail>
16     </author>
17     <author title="Editor">
18     <mail link="neysx@gentoo.org">Xavier Neys</mail>
19     </author>
20 nightmorph 1.30 <author title="Editor">
21     <mail link="nightmorph"/>
22     </author>
23 neysx 1.1
24     <abstract>
25     This is the Gentoo Linux/AMD64 Frequently Asked Questions
26     </abstract>
27    
28     <!-- The content of this document is licensed under the CC-BY-SA license -->
29     <!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
30     <license/>
31    
32 nightmorph 1.33 <version>1.24</version>
33     <date>2009-04-24</date>
34 neysx 1.1
35 neysx 1.26 <faqindex>
36 neysx 1.1 <title>Questions</title>
37     <section>
38     <title>Introduction to Gentoo/AMD64 FAQ</title>
39     <body>
40    
41     <p>
42     This document contains the most commonly asked questions about Gentoo/AMD64. We
43     intend to help and provide useful information about Gentoo/AMD64. Some of these
44 neysx 1.22 questions can be found in forums, IRC, or mailing lists. If you have
45     suggestions or questions about this FAQ, you are welcome to send an e-mail to
46     <mail>amd64@gentoo.org</mail>.
47 neysx 1.1 </p>
48    
49     </body>
50     </section>
51 neysx 1.26 </faqindex>
52 neysx 1.1
53     <chapter>
54     <title>Installation</title>
55     <section id="cflags">
56     <title>What CFLAGS should I use for AMD64/EM64T?</title>
57     <body>
58    
59     <p>
60     You should use simple <c>CFLAGS</c> to avoid future problems with your system.
61 neysx 1.22 Supported <c>CFLAGS</c> are <c>-O2 -march=k8 -pipe</c> for non-EM64T systems and
62     <c>-O2 -march=nocona -pipe</c> for EM64T systems.
63 neysx 1.1 </p>
64    
65     </body>
66     </section>
67     <section id="kernel">
68     <title>What kernel should I use for AMD64?</title>
69     <body>
70    
71     <p>
72 smithj 1.2 You can use almost all kernel sources available in Portage. We recommend using
73     <c>gentoo-sources</c> because it is a special kernel designed for Gentoo Linux.
74     It contains lots of AMD64-specific patches and therefore is the only kernel
75 neysx 1.22 officially supported by Gentoo/AMD64.
76 neysx 1.1 </p>
77    
78     <warn>
79 smithj 1.2 You should watch out for some kernel features which are not well tested, such
80 neysx 1.1 as <c>PREEMPT</c>.
81     </warn>
82    
83 neysx 1.22 <p>
84     Make sure you have the <c>IA32_EMULATION</c> option activated in the kernel.
85     </p>
86    
87     <pre caption="Activating IA32 Emulation in Kernel source">
88     # <i>cd /usr/src/linux</i>
89     # <i>make menuconfig</i>
90    
91     Executable file formats / Emulations ---&gt;
92     [*] IA32 Emulation
93     </pre>
94    
95     <warn>
96     You may experience build failures on multilib-systems if you deactivate this
97     option.
98     </warn>
99    
100 neysx 1.1 </body>
101     </section>
102     <section id="perfup">
103 neysx 1.23 <title>Will I have a performance upgrade if I use a 64bit system instead of 32bit?</title>
104 neysx 1.1 <body>
105    
106     <p>
107     That is a difficult question to answer. In some cases, you will experience a
108 nightmorph 1.32 performance improvement, in other cases you will not. For everyday use, there is
109     nearly no difference between 64bit and 32bit. 64bit is generally faster when it
110     comes to floating point computing which is normally the case in multimedia
111     applications and 3D rendering. This <uri
112     link="http://www.linux.com/articles/114024?tid=121">article</uri> (and a <uri
113     link="http://www.linux.com/feature/43873">related</uri> article) may interest
114     you. There's also a nice <uri
115     link="http://forums.gentoo.org/viewtopic-t-349691.html">thread</uri> in our <uri
116     link="http://forums.gentoo.org">forums</uri>.
117 neysx 1.1 </p>
118    
119     </body>
120     </section>
121     <section id="multilib">
122     <title>What is multilib and how can I use it?</title>
123     <body>
124    
125     <p>
126 neysx 1.23 Every AMD64 processor is able to run 32bit code as well as 64bit code.
127     However, when you have a 32bit application, you are unable to mix it with
128     64bit libraries or vice versa. You can, however, natively run 32bit
129     applications if all shared libraries it needs are available as 32bit objects.
130 smithj 1.2 You can choose whether you want multilib support or not by selecting the
131 neysx 1.1 according profile. The default is a multilib-enabled profile.
132     </p>
133    
134 neysx 1.22 <warn>
135     Currently you cannot switch from a no-multilib to a multilib-enabled profile,
136     so think over your decision twice before you use the no-multilib profile.
137     </warn>
138    
139 neysx 1.1 </body>
140     </section>
141     <section id="chroot32">
142 neysx 1.23 <title>How do I create a 32bit chroot?</title>
143 neysx 1.1 <body>
144    
145     <p>
146 neysx 1.23 Please read the <uri link="/proj/en/base/amd64/howtos/chroot.xml">32bit chroot
147 neysx 1.1 guide</uri>.
148     </p>
149    
150     </body>
151     </section>
152     <section id="upgradex86">
153     <title>Can I upgrade from my x86 system to amd64 by doing emerge -e world?</title>
154     <body>
155    
156     <p>
157     Due to several differences between an <c>x86</c> and an <c>amd64</c>
158     installation, it is impossible to upgrade. Please perform a fresh install. The
159 smithj 1.2 installation is slightly different than an x86 one, so please use the
160 neysx 1.1 <uri link="/doc/en/handbook/handbook-amd64.xml">AMD64 Handbook</uri>.
161     </p>
162    
163 nightmorph 1.29 <p>
164     Also, binary files created on an x86 system most likely cannot be read by
165     packages on an amd64 system. In particular, databases such as MySQL, innoDB,
166     Berkeley DB, SQLite, OpenLDAP, etc. cannot simply be copied as-is. You will need
167     to dump the database into an architecture-independent format, such as a text
168     file, before attempting to restore it on an amd64 system.
169     </p>
170    
171 neysx 1.1 </body>
172     </section>
173 jkt 1.14 <section id="reiser4">
174     <title>Can I use Reiser4?</title>
175     <body>
176    
177     <p>
178     Reiser4 is not available from any kernel offered by the Gentoo Kernel project,
179     thus neither AMD64 team supports it. The answer is no.
180     </p>
181 nightmorph 1.17
182 jkt 1.14 </body>
183     </section>
184 neysx 1.1 </chapter>
185    
186     <chapter>
187     <title>Hardware</title>
188     <section id="videobindrivers">
189     <title>Will my binary NVIDIA/ATI drivers work?</title>
190     <body>
191    
192     <p>
193     Yes, NVIDIA and ATI provide drivers that work on AMD64. You can install them by
194 nightmorph 1.25 executing <c>emerge nvidia-drivers</c> or <c>emerge ati-drivers</c>. If you have
195     more questions about these drivers, you should read the <uri
196     link="/doc/en/nvidia-guide.xml">Nvidia guide</uri> or the <uri
197     link="/doc/en/ati-faq.xml">ATI FAQ</uri>.
198 neysx 1.1 </p>
199    
200     </body>
201     </section>
202     <section id="coolnquiet">
203 nightmorph 1.17 <title>How do I use Cool'n'Quiet/PowerNow features?</title>
204 neysx 1.1 <body>
205    
206     <p>
207     You have to compile your kernel with support for these features. You just need
208 smithj 1.2 to enable the features below:
209 neysx 1.1 </p>
210    
211 nightmorph 1.17 <pre caption="Kernel options for Cool'n'Quiet/PowerNow">
212 neysx 1.1 Power management options ---&gt;
213     [*] Power Management support
214     CPU Frequency scaling ---&gt;
215     [*] CPU Frequency scaling
216     [*] CPU frequency table helpers
217     [*] AMD Opteron/Athlon64 PowerNow!
218     </pre>
219    
220     <p>
221     Then <c>emerge cpudyn</c> and edit <path>/etc/conf.d/cpudyn</path> with your
222     favorite editor.
223     </p>
224    
225     <pre caption="Example of /etc/conf.d/cpudyn">
226     INTERVAL=1
227     CPU_UP=0.5
228     CPU_DOWN=0.9
229     THROTTLING_LOW=7
230     CPUFREQ_25="/sys/devices/system/cpu/cpu0/cpufreq /sysfs/devices/system/cpu/cpu0/cpufreq"
231     CPUFREQ_ACPI="/proc/acpi/processor/CPU0/throttling"
232     </pre>
233    
234     <p>
235 smithj 1.2 Now you only have to run <c>rc-update add cpudyn default</c> to make sure it is
236     started every time you boot.
237 neysx 1.1 </p>
238    
239 nightmorph 1.24 <note>
240     You may want to read the <uri
241     link="/doc/en/power-management-guide.xml#doc_chap3">Power Management Guide</uri>
242     for more tips on CPU power management.
243     </note>
244    
245 neysx 1.1 </body>
246     </section>
247     </chapter>
248    
249     <chapter>
250     <title>Applications</title>
251     <section id="flash">
252 nightmorph 1.31 <title>Can I get Adobe Flash working?</title>
253 neysx 1.1 <body>
254    
255     <p>
256 nightmorph 1.33 Yes. Just <c>emerge adobe-flash</c>. Adobe has provided a 64-bit Flash plugin
257     starting with version 10.0.22.87. If you don't need the 32-bit plugin, then run
258     <c>echo "www-plugins/adobe-flash -32bit" >> /etc/portage/package.use</c>. This
259     will install only the 64-bit Flash plugin.
260 neysx 1.1 </p>
261    
262     </body>
263     </section>
264     <section id="OOo">
265     <title>Can I get OpenOffice.org working?</title>
266     <body>
267    
268     <p>
269 nightmorph 1.31 Yes. Run <c>emerge openoffice</c>. It may take several hours and use most of
270     your system resources. If you don't think your machine is up to it, you can try
271     installing the precompiled binary, <c>openoffice-bin</c>.
272 neysx 1.1 </p>
273    
274     </body>
275     </section>
276     <section id="masked">
277     <title>I want to install package foo, but emerge says: (masked by: ~amd64 keyword)</title>
278     <body>
279    
280     <p>
281     This means that the package is still in the 'testing' tree. Please read <c>man
282     portage</c> or the <uri
283     link="/doc/en/handbook/handbook-amd64.xml?part=3&amp;chap=3">Mixing Software
284     Branches</uri> chapter of the <uri
285     link="/doc/en/handbook/handbook-amd64.xml">AMD64 Handbook</uri> for more
286     information.
287     </p>
288    
289     </body>
290     </section>
291     <section id="keyword">
292     <title>I want to install package foo, but emerge says: (masked by: missing keyword)</title>
293     <body>
294    
295     <p>
296     This means that the package has not been tested yet. It does <e>not
297     necessarily</e> mean that the package does not work. You can unmask it by
298 neysx 1.9 accepting another architecture for the package. The following example shows you
299 neysx 1.22 can tell Portage to accept any keyword for a given package.
300 neysx 1.1 </p>
301    
302     <pre caption="Example of adding package keywords">
303 nightmorph 1.28 # <i>echo "category/packagename **" >> /etc/portage/package.keywords</i>
304 nightmorph 1.21 # <i>emerge packagename</i>
305 neysx 1.1 </pre>
306    
307     <p>
308     If it works fine for you, please let us know and file a bug on <uri
309 neysx 1.9 link="http://bugs.gentoo.org/">Gentoo's Bugzilla</uri>, so that the AMD64 team
310     can keyword the package and other users can benefit from your test.
311 neysx 1.1 </p>
312    
313     <warn>
314 neysx 1.22 Do not try commands like <c>ACCEPT_KEYWORDS="~x86" emerge packagename</c>. It
315 nightmorph 1.21 will most certainly break your tree.
316 neysx 1.1 </warn>
317    
318     </body>
319     </section>
320     </chapter>
321    
322     <chapter>
323 fox2mike 1.16 <title>How can I help the Gentoo/AMD64 project?</title>
324 neysx 1.1 <section id="project">
325     <title>How can I help?</title>
326     <body>
327    
328     <p>
329     With a growing popularity of the amd64 architecture, we also increasingly need
330     more help. There's still much work to be done to improve the quality of
331     Gentoo/AMD64. An average user can help us by:
332     </p>
333    
334     <ul>
335     <li>Filing general bug reports</li>
336     <li>Testing software that does not yet have the <c>~amd64</c> keyword</li>
337     <li>
338 neysx 1.22 Participating in the <uri link="/proj/en/base/amd64/at/">Arch Testers
339 neysx 1.1 project</uri>
340     </li>
341     <li>
342     Help answering questions on the mailing lists, forums and IRC channels
343     </li>
344     <li>Sending patches</li>
345     </ul>
346    
347     </body>
348     </section>
349     </chapter>
350    
351     <chapter>
352     <title>Other Resources</title>
353     <section id="other">
354     <title>Where can I get more help or information about Gentoo/AMD64?</title>
355     <body>
356    
357     <p>
358 neysx 1.22 If any of your questions wasn't answered here, you can try other resources
359     listed on <uri link="/proj/en/base/amd64/">our project homepage</uri>. You can
360 neysx 1.1 also ask us at <c>#gentoo-amd64</c> on <c>irc.freenode.net</c>, <uri
361     link="http://forums.gentoo.org/viewforum-f-46.html">Gentoo/AMD64 Forums</uri>,
362     or on the <c>gentoo-amd64@lists.gentoo.org</c> mailing list.
363     </p>
364    
365     </body>
366     </section>
367     </chapter>
368    
369     </guide>

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