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authorbmah <bmah@FreeBSD.org>2003-04-25 15:13:18 +0000
committerbmah <bmah@FreeBSD.org>2003-04-25 15:13:18 +0000
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<sect1 id="proc">
<title>Supported Processors and Motherboards</title>
- <para>&os;/i386 runs on a wide variety of
- <quote>IBM PC compatible</quote> machines. Due to the wide range of
- hardware available for this architecture, it is impossible to
- exhaustively list all combinations of equipment supported by &os;.
- Nevertheless, some general guidelines are presented here.</para>
+ <para>&os;/i386 runs on a wide variety of <quote>IBM PC
+ compatible</quote> machines. Due to the wide range of hardware
+ available for this architecture, it is impossible to exhaustively
+ list all combinations of equipment supported by &os;.
+ Nevertheless, some general guidelines are presented here.</para>
<para>Almost all i386-compatible processors are supported. All
- Intel processors beginning with the 80386 are supported, including
- the 80386, 80486, Pentium, Pentium Pro, Pentium II, Pentium III,
- Pentium 4, and variants thereof, such as the Xeon and Celeron
- processors. (While technically supported, the use of the 80386SX is
- specifically not recommended.) All i386-compatible AMD processors
- are also supported, including the Am486, Am5x86, K5, K6 (and variants),
- Athlon (including Athlon-MP, Athlon-XP, Athlon-4, and Athlon Thunderbird), and Duron processors.
- The AMD &Eacute;lan SC520 embedded processor is supported.
- The Transmeta Crusoe is recognized
- and supported, as are i386-compatible processors from Cyrix and
- NexGen.</para>
+ Intel processors beginning with the 80386 are supported, including
+ the 80386, 80486, Pentium, Pentium Pro, Pentium II, Pentium III,
+ Pentium 4, and variants thereof, such as the Xeon and Celeron
+ processors. (While technically supported, the use of the 80386SX
+ is specifically not recommended.) All i386-compatible AMD
+ processors are also supported, including the Am486, Am5x86, K5, K6
+ (and variants), Athlon (including Athlon-MP, Athlon-XP, Athlon-4,
+ and Athlon Thunderbird), and Duron processors. The AMD
+ &Eacute;lan SC520 embedded processor is supported. The Transmeta
+ Crusoe is recognized and supported, as are i386-compatible
+ processors from Cyrix and NexGen.</para>
<para>There is a wide variety of motherboards available for this
- architecture. Motherboards using the ISA, VLB, EISA, AGP, and PCI
- expansion busses are well-supported. There is some limited support
- for the MCA (<quote>MicroChannel</quote>) expansion bus used in the
- IBM PS/2 line of PCs.</para>
+ architecture. Motherboards using the ISA, VLB, EISA, AGP, and PCI
+ expansion busses are well-supported. There is some limited
+ support for the MCA (<quote>MicroChannel</quote>) expansion bus
+ used in the IBM PS/2 line of PCs.</para>
<para>Symmetric multi-processor (SMP) systems are generally
- supported by &os;, although in some cases, BIOS or motherboard bugs
- may generate some problems. Perusal of the archives of the &a.smp;
- may yield some clues.</para>
+ supported by &os;, although in some cases, BIOS or motherboard
+ bugs may generate some problems. Perusal of the archives of the
+ &a.smp; may yield some clues.</para>
<para>&os; will take advantage of HyperThreading (HTT) support on
Intel CPUs that support this feature. A kernel with the
- <literal>options&nbsp;SMP</literal> feature enabled will automatically detect the
- additional logical processors. The default &os; scheduler treats
- the logical processors the same as additional physical
- processors; in other words, no attempt is made to optimize
- scheduling decisions given the shared resources between logical
- processors within the same CPU. Because this naive scheduling can
- result in suboptimal performance, the logical CPUs are halted by
- default at startup. They can be enabled
- with the <varname>machdep.hlt_logical_cpus</varname> sysctl
- variable. It is also possible to halt any CPU in the idle
- loop with the <varname>machdep.hlt_cpus</varname> sysctl
- variable. The &man.smp.4; manual page has more details.</para>
+ <literal>options&nbsp;SMP</literal> feature enabled will
+ automatically detect the additional logical processors. The
+ default &os; scheduler treats the logical processors the same as
+ additional physical processors; in other words, no attempt is made
+ to optimize scheduling decisions given the shared resources
+ between logical processors within the same CPU. Because this
+ naive scheduling can result in suboptimal performance, the logical
+ CPUs are halted by default at startup. They can be enabled with
+ the <varname>machdep.hlt_logical_cpus</varname> sysctl variable.
+ It is also possible to halt any CPU in the idle loop with the
+ <varname>machdep.hlt_cpus</varname> sysctl variable. The
+ &man.smp.4; manual page has more details.</para>
<para>&os; will generally run on i386-based laptops, albeit with
- varying levels of support for certain hardware features such as
- sound, graphics, power management, and PCCARD expansion slots.
- These features tend to vary in idiosyncratic ways between machines,
- and frequently require special-case support in &os; to work around
- hardware bugs or other oddities. When in doubt, a search of the
- archives of the &a.mobile; may be useful.</para>
+ varying levels of support for certain hardware features such as
+ sound, graphics, power management, and PCCARD expansion slots.
+ These features tend to vary in idiosyncratic ways between
+ machines, and frequently require special-case support in &os; to
+ work around hardware bugs or other oddities. When in doubt, a
+ search of the archives of the &a.mobile; may be useful.</para>
+
</sect1>
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