SMP on x86: Difference between revisions
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The primary specification for multiprocessor [[x86]]-based setups is the [http://www.intel.com/design/pentium/datashts/242016.HTM Intel MultiProcessor Specification] (last updated, AFAIK, to revision-006 on 1995-05-15). | The primary specification for multiprocessor [[x86]]-based setups is the [http://www.intel.com/design/pentium/datashts/242016.HTM Intel MultiProcessor Specification] (last updated, AFAIK, to revision-006 on 1995-05-15). | ||
==SMT== | |||
* HyperThreading (Intel SMT) requires CPU, BIOS and OS support. Introduced on the P4. | |||
** Found on (all) i7's, [http://www.intel.com/technology/atom/microarchitecture.htm some Atoms], and some P4's and Core2Duo's (especially those with Xeon branding). | |||
** Pentium-M and Celerons usually lack SMT. | |||
==Interrupts== | ==Interrupts== | ||
* IO-APIC routes hardware interrupts to various CPUs ([http://www.mjmwired.net/kernel/Documentation/x86/i386/IO-APIC.txt Linux's IO-APIC.txt]) | * IO-APIC routes hardware interrupts to various CPUs ([http://www.mjmwired.net/kernel/Documentation/x86/i386/IO-APIC.txt Linux's IO-APIC.txt]) | ||
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MIS: 0 | MIS: 0 | ||
[recombinator](0) $ </pre> | [recombinator](0) $ </pre> | ||
== | ==Discovery== | ||
* ACPI's MADT table can supply multiprocessor configuration, and is usually used if present | * ACPI's MADT table can supply multiprocessor configuration, and is usually used if present | ||
* MP Table. The FreeBSD program <tt>mptable(1)</tt> can dump this: | * MP Table. The FreeBSD program <tt>mptable(1)</tt> can dump this: | ||
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[bryhlath](0) $ </pre> | [bryhlath](0) $ </pre> | ||
==/proc/cpuinfo== | ==/proc/cpuinfo== | ||