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update the amd64 faq with a few notes from robbat2 and pva, bug 232464

1 neysx 1.1 <?xml version="1.0" encoding="UTF-8"?>
2     <!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
3 nightmorph 1.29 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/gentoo-amd64-faq.xml,v 1.28 2008/07/25 18:55:00 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    
21     <abstract>
22     This is the Gentoo Linux/AMD64 Frequently Asked Questions
23     </abstract>
24    
25     <!-- The content of this document is licensed under the CC-BY-SA license -->
26     <!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
27     <license/>
28    
29 nightmorph 1.29 <version>1.20</version>
30     <date>2008-09-02</date>
31 neysx 1.1
32 neysx 1.26 <faqindex>
33 neysx 1.1 <title>Questions</title>
34     <section>
35     <title>Introduction to Gentoo/AMD64 FAQ</title>
36     <body>
37    
38     <p>
39     This document contains the most commonly asked questions about Gentoo/AMD64. We
40     intend to help and provide useful information about Gentoo/AMD64. Some of these
41 neysx 1.22 questions can be found in forums, IRC, or mailing lists. If you have
42     suggestions or questions about this FAQ, you are welcome to send an e-mail to
43     <mail>amd64@gentoo.org</mail>.
44 neysx 1.1 </p>
45    
46     </body>
47     </section>
48 neysx 1.26 </faqindex>
49 neysx 1.1
50     <chapter>
51     <title>Installation</title>
52     <section id="cflags">
53     <title>What CFLAGS should I use for AMD64/EM64T?</title>
54     <body>
55    
56     <p>
57     You should use simple <c>CFLAGS</c> to avoid future problems with your system.
58 neysx 1.22 Supported <c>CFLAGS</c> are <c>-O2 -march=k8 -pipe</c> for non-EM64T systems and
59     <c>-O2 -march=nocona -pipe</c> for EM64T systems.
60 neysx 1.1 </p>
61    
62     </body>
63     </section>
64     <section id="kernel">
65     <title>What kernel should I use for AMD64?</title>
66     <body>
67    
68     <p>
69 smithj 1.2 You can use almost all kernel sources available in Portage. We recommend using
70     <c>gentoo-sources</c> because it is a special kernel designed for Gentoo Linux.
71     It contains lots of AMD64-specific patches and therefore is the only kernel
72 neysx 1.22 officially supported by Gentoo/AMD64.
73 neysx 1.1 </p>
74    
75     <warn>
76 smithj 1.2 You should watch out for some kernel features which are not well tested, such
77 neysx 1.1 as <c>PREEMPT</c>.
78     </warn>
79    
80 neysx 1.22 <p>
81     Make sure you have the <c>IA32_EMULATION</c> option activated in the kernel.
82     </p>
83    
84     <pre caption="Activating IA32 Emulation in Kernel source">
85     # <i>cd /usr/src/linux</i>
86     # <i>make menuconfig</i>
87    
88     Executable file formats / Emulations ---&gt;
89     [*] IA32 Emulation
90     </pre>
91    
92     <warn>
93     You may experience build failures on multilib-systems if you deactivate this
94     option.
95     </warn>
96    
97 neysx 1.1 </body>
98     </section>
99     <section id="perfup">
100 neysx 1.23 <title>Will I have a performance upgrade if I use a 64bit system instead of 32bit?</title>
101 neysx 1.1 <body>
102    
103     <p>
104     That is a difficult question to answer. In some cases, you will experience a
105     performance improvement, in other cases you will not. For everyday use, there
106 neysx 1.23 is nearly no difference between 64bit and 32bit. 64bit is generally faster
107 neysx 1.1 when it comes to floating point computing which is normally the case in
108     multimedia applications and 3D rendering. This <uri
109     link="http://enterprise.linux.com/enterprise/05/06/09/1413209.shtml?tid=121">article</uri>
110     may interest you. There's also a nice <uri
111     link="http://forums.gentoo.org/viewtopic-t-349691.html">thread</uri> in our
112     <uri link="http://forums.gentoo.org">forums</uri>.
113     </p>
114    
115     </body>
116     </section>
117     <section id="multilib">
118     <title>What is multilib and how can I use it?</title>
119     <body>
120    
121     <p>
122 neysx 1.23 Every AMD64 processor is able to run 32bit code as well as 64bit code.
123     However, when you have a 32bit application, you are unable to mix it with
124     64bit libraries or vice versa. You can, however, natively run 32bit
125     applications if all shared libraries it needs are available as 32bit objects.
126 smithj 1.2 You can choose whether you want multilib support or not by selecting the
127 neysx 1.1 according profile. The default is a multilib-enabled profile.
128     </p>
129    
130 neysx 1.22 <warn>
131     Currently you cannot switch from a no-multilib to a multilib-enabled profile,
132     so think over your decision twice before you use the no-multilib profile.
133     </warn>
134    
135 neysx 1.1 </body>
136     </section>
137     <section id="chroot32">
138 neysx 1.23 <title>How do I create a 32bit chroot?</title>
139 neysx 1.1 <body>
140    
141     <p>
142 neysx 1.23 Please read the <uri link="/proj/en/base/amd64/howtos/chroot.xml">32bit chroot
143 neysx 1.1 guide</uri>.
144     </p>
145    
146     </body>
147     </section>
148     <section id="upgradex86">
149     <title>Can I upgrade from my x86 system to amd64 by doing emerge -e world?</title>
150     <body>
151    
152     <p>
153     Due to several differences between an <c>x86</c> and an <c>amd64</c>
154     installation, it is impossible to upgrade. Please perform a fresh install. The
155 smithj 1.2 installation is slightly different than an x86 one, so please use the
156 neysx 1.1 <uri link="/doc/en/handbook/handbook-amd64.xml">AMD64 Handbook</uri>.
157     </p>
158    
159 nightmorph 1.29 <p>
160     Also, binary files created on an x86 system most likely cannot be read by
161     packages on an amd64 system. In particular, databases such as MySQL, innoDB,
162     Berkeley DB, SQLite, OpenLDAP, etc. cannot simply be copied as-is. You will need
163     to dump the database into an architecture-independent format, such as a text
164     file, before attempting to restore it on an amd64 system.
165     </p>
166    
167 neysx 1.1 </body>
168     </section>
169 jkt 1.14 <section id="reiser4">
170     <title>Can I use Reiser4?</title>
171     <body>
172    
173     <p>
174     Reiser4 is not available from any kernel offered by the Gentoo Kernel project,
175     thus neither AMD64 team supports it. The answer is no.
176     </p>
177 nightmorph 1.17
178 jkt 1.14 </body>
179     </section>
180 neysx 1.1 </chapter>
181    
182     <chapter>
183     <title>Hardware</title>
184     <section id="videobindrivers">
185     <title>Will my binary NVIDIA/ATI drivers work?</title>
186     <body>
187    
188     <p>
189     Yes, NVIDIA and ATI provide drivers that work on AMD64. You can install them by
190 nightmorph 1.25 executing <c>emerge nvidia-drivers</c> or <c>emerge ati-drivers</c>. If you have
191     more questions about these drivers, you should read the <uri
192     link="/doc/en/nvidia-guide.xml">Nvidia guide</uri> or the <uri
193     link="/doc/en/ati-faq.xml">ATI FAQ</uri>.
194 neysx 1.1 </p>
195    
196     </body>
197     </section>
198     <section id="coolnquiet">
199 nightmorph 1.17 <title>How do I use Cool'n'Quiet/PowerNow features?</title>
200 neysx 1.1 <body>
201    
202     <p>
203     You have to compile your kernel with support for these features. You just need
204 smithj 1.2 to enable the features below:
205 neysx 1.1 </p>
206    
207 nightmorph 1.17 <pre caption="Kernel options for Cool'n'Quiet/PowerNow">
208 neysx 1.1 Power management options ---&gt;
209     [*] Power Management support
210     CPU Frequency scaling ---&gt;
211     [*] CPU Frequency scaling
212     [*] CPU frequency table helpers
213     [*] AMD Opteron/Athlon64 PowerNow!
214     </pre>
215    
216     <p>
217     Then <c>emerge cpudyn</c> and edit <path>/etc/conf.d/cpudyn</path> with your
218     favorite editor.
219     </p>
220    
221     <pre caption="Example of /etc/conf.d/cpudyn">
222     INTERVAL=1
223     CPU_UP=0.5
224     CPU_DOWN=0.9
225     THROTTLING_LOW=7
226     CPUFREQ_25="/sys/devices/system/cpu/cpu0/cpufreq /sysfs/devices/system/cpu/cpu0/cpufreq"
227     CPUFREQ_ACPI="/proc/acpi/processor/CPU0/throttling"
228     </pre>
229    
230     <p>
231 smithj 1.2 Now you only have to run <c>rc-update add cpudyn default</c> to make sure it is
232     started every time you boot.
233 neysx 1.1 </p>
234    
235 nightmorph 1.24 <note>
236     You may want to read the <uri
237     link="/doc/en/power-management-guide.xml#doc_chap3">Power Management Guide</uri>
238     for more tips on CPU power management.
239     </note>
240    
241 neysx 1.1 </body>
242     </section>
243     </chapter>
244    
245     <chapter>
246     <title>Applications</title>
247     <section id="flash">
248     <title>Can I get Macromedia Flash working?</title>
249     <body>
250    
251     <p>
252 neysx 1.23 Yes. To get Flash working, you need a 32bit browser like
253 neysx 1.1 <c>mozilla-firefox-bin</c> or <c>opera</c> because Macromedia doesn't provide a
254 neysx 1.23 64bit version. After emerging the -bin package of your favorite browser,
255 nightmorph 1.17 install Flash by doing <c>emerge netscape-flash</c>.
256 neysx 1.1 </p>
257    
258     </body>
259     </section>
260     <section id="OOo">
261     <title>Can I get OpenOffice.org working?</title>
262     <body>
263    
264     <p>
265 swift 1.27 OpenOffice versions prior to 2.0.4 do not build on 64bit systems, so you have to
266     use the 32bit binary version, available in Portage as
267     <c>app-office/openoffice-bin</c>. If you feel brave you can <c>emerge
268     openoffice</c>, but be aware that the 64bit version is not yet tested out
269     enough to be considered stable.
270 neysx 1.1 </p>
271    
272     </body>
273     </section>
274     <section id="masked">
275     <title>I want to install package foo, but emerge says: (masked by: ~amd64 keyword)</title>
276     <body>
277    
278     <p>
279     This means that the package is still in the 'testing' tree. Please read <c>man
280     portage</c> or the <uri
281     link="/doc/en/handbook/handbook-amd64.xml?part=3&amp;chap=3">Mixing Software
282     Branches</uri> chapter of the <uri
283     link="/doc/en/handbook/handbook-amd64.xml">AMD64 Handbook</uri> for more
284     information.
285     </p>
286    
287     </body>
288     </section>
289     <section id="keyword">
290     <title>I want to install package foo, but emerge says: (masked by: missing keyword)</title>
291     <body>
292    
293     <p>
294     This means that the package has not been tested yet. It does <e>not
295     necessarily</e> mean that the package does not work. You can unmask it by
296 neysx 1.9 accepting another architecture for the package. The following example shows you
297 neysx 1.22 can tell Portage to accept any keyword for a given package.
298 neysx 1.1 </p>
299    
300     <pre caption="Example of adding package keywords">
301 nightmorph 1.28 # <i>echo "category/packagename **" >> /etc/portage/package.keywords</i>
302 nightmorph 1.21 # <i>emerge packagename</i>
303 neysx 1.1 </pre>
304    
305     <p>
306     If it works fine for you, please let us know and file a bug on <uri
307 neysx 1.9 link="http://bugs.gentoo.org/">Gentoo's Bugzilla</uri>, so that the AMD64 team
308     can keyword the package and other users can benefit from your test.
309 neysx 1.1 </p>
310    
311     <warn>
312 neysx 1.22 Do not try commands like <c>ACCEPT_KEYWORDS="~x86" emerge packagename</c>. It
313 nightmorph 1.21 will most certainly break your tree.
314 neysx 1.1 </warn>
315    
316     </body>
317     </section>
318     </chapter>
319    
320     <chapter>
321 fox2mike 1.16 <title>How can I help the Gentoo/AMD64 project?</title>
322 neysx 1.1 <section id="project">
323     <title>How can I help?</title>
324     <body>
325    
326     <p>
327     With a growing popularity of the amd64 architecture, we also increasingly need
328     more help. There's still much work to be done to improve the quality of
329     Gentoo/AMD64. An average user can help us by:
330     </p>
331    
332     <ul>
333     <li>Filing general bug reports</li>
334     <li>Testing software that does not yet have the <c>~amd64</c> keyword</li>
335     <li>
336 neysx 1.22 Participating in the <uri link="/proj/en/base/amd64/at/">Arch Testers
337 neysx 1.1 project</uri>
338     </li>
339     <li>
340     Help answering questions on the mailing lists, forums and IRC channels
341     </li>
342     <li>Sending patches</li>
343     </ul>
344    
345     </body>
346     </section>
347     </chapter>
348    
349     <chapter>
350     <title>Other Resources</title>
351     <section id="other">
352     <title>Where can I get more help or information about Gentoo/AMD64?</title>
353     <body>
354    
355     <p>
356 neysx 1.22 If any of your questions wasn't answered here, you can try other resources
357     listed on <uri link="/proj/en/base/amd64/">our project homepage</uri>. You can
358 neysx 1.1 also ask us at <c>#gentoo-amd64</c> on <c>irc.freenode.net</c>, <uri
359     link="http://forums.gentoo.org/viewforum-f-46.html">Gentoo/AMD64 Forums</uri>,
360     or on the <c>gentoo-amd64@lists.gentoo.org</c> mailing list.
361     </p>
362    
363     </body>
364     </section>
365     </chapter>
366    
367     </guide>

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