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SMP(4)                DragonFly Kernel Interfaces Manual                SMP(4)


NAME

     SMP -- description of the Symmetric MultiProcessor kernel


DESCRIPTION

     The DragonFly kernel implements symmetric multiprocessor support by
     default.  APIC I/O can be enabled or disabled by setting the
     hw.ioapic_enable loader tunable to 1 or 0.  DragonFly's default is to
     enable APIC I/O on real hardware and to disable it in virtual machines,
     as determined by the VMM bit in the CPU features.


COMPATIBILITY

     The SMP kernel supports motherboards that follow the Intel MP specifica-
     tion, version 1.4.


SEE ALSO

     mptable(1), dmesg(8)


HISTORY

     The SMP kernel's early history is not (properly) recorded.  It was devel-
     oped in a separate CVS branch until April 26, 1997, at which point it was
     merged into 3.0-current.  By this date 3.0-current had already been
     merged with Lite2 kernel code.

     Starting with DragonFly 3.3, the kernel has SMP support by default and it
     is no longer optional.


AUTHORS

     Steve Passe <fsmp@FreeBSD.org>


BUGS

     That would be a good guess...

DragonFly 3.5                   August 17, 2013                  DragonFly 3.5

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