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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 1.33 2009/04/24 17:13:41 nightmorph Exp $ --> 3<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/gentoo-amd64-faq.xml,v 1.34 2009/06/13 07:38:31 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>1.24</version> 32<version>1.25</version>
33<date>2009-04-24</date> 33<date>2009-06-13</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>
50</section> 50</section>
51</faqindex> 51</faqindex>
52 52
53<chapter> 53<chapter>
54<title>Installation</title> 54<title>Installation</title>
55<section id="difference">
56<title>What's the difference between AMD64 and EM64T?</title>
57<body>
58
59<p>
60Both refer to 64-bit processors from AMD (AMD64) and Intel (EM64T). AMD's 64-bit
61processors include the Athlon 64, Turion, Neo, Phenom, and Opteron families. Intel's
6264-bit processors include the Core2, Celeron, Xeon, and Pentium (all based on
63the Core2 architecture). The <uri
64link="http://en.wikipedia.org/wiki/Em64t#Intel_64">last few versions</uri> of the
65old Pentium 4 and Xeon chips also support EM64T.
66</p>
67
68<p>
69The AMD line of 64-bit processors were released well ahead of Intel's offering.
70Therefore, for historical reasons the arch keyword for all x86-64 compatible
71architectures is amd64. As such, <e>AMD64</e> is a generic reference to 64-bit
72chips, whether AMD or Intel.
73</p>
74
75</body>
76</section>
55<section id="cflags"> 77<section id="cflags">
56<title>What CFLAGS should I use for AMD64/EM64T?</title> 78<title>What CFLAGS should I use for AMD64/EM64T?</title>
57<body> 79<body>
58 80
59<p> 81<p>
60You should use simple <c>CFLAGS</c> to avoid future problems with your system. 82You should use simple <c>CFLAGS</c> to avoid future problems with your system.
61Supported <c>CFLAGS</c> are <c>-O2 -march=k8 -pipe</c> for non-EM64T systems and 83Supported <c>CFLAGS</c> are <c>-O2 -march=k8 -pipe</c> for AMD systems. Intel
62<c>-O2 -march=nocona -pipe</c> for EM64T systems. 84Core2-based systems (EM64T) should use <c>-O2 -march=core2 -pipe</c>. If you're
85on an old Intel Pentium 4 that supports EM64T, then use <c>-O2 -march=nocona
86-pipe</c>.
63</p> 87</p>
64 88
65</body> 89</body>
66</section> 90</section>
67<section id="kernel"> 91<section id="kernel">

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