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FreeBSD Kernel Interfaces Manual                 SMP(4)
SMP -- description of the FreeBSD Symmetric Multi-Processor
kernel       options SMP       The SMP kernel implements
symmetric multi-processor support.       Support for multi-
processor systems is present for all Tier-1 architec-      tures
on FreeBSD.  Currently, this includes amd64, i386, ia64, and
sparc64.  Support is enabled using options SMP.  It is
permissible to use      the SMP kernel configuration on non-SMP
equipped motherboards.       For i386 systems, the SMP kernel
supports motherboards that follow the      the status of multi-
processor support.       sysctl variable hw.ncpu.       The
sysctl variable machdep.hlt_cpus is an integer bitmask denoting
CPUs      to halt, counting from 0.  Setting a bit to 1 will
result in the corre-      sponding CPU being d