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$FreeBSD: head/share/man/man4/smp.4 107700 2002-12-09 12:28:33Z ru $
.Dd December 5, 2002 .Dt SMP 4 .Os .Sh NAME .Nm SMP .Nd description of the FreeBSD Symmetric MultiProcessor kernel .Sh SYNOPSIS .Cd options SMP .Cd options APIC_IO .Sh DESCRIPTION The .Nm kernel implements symmetric multiprocessor support. .Sh COMPATIBILITY Support for multi-processor systems is present for all supported architectures on .Fx . Currently, this includes alpha, i386, ia64, and sparc64. Support is enabled using .Cd options SMP . On some, but not all platforms, it is permissible to use the SMP kernel configuration on non-SMP equipped motherboards.
p For i386 systems, the .Nm kernel supports motherboards that follow the Intel MP specification, version 1.4. In addition to .Cd options SMP , i386 also requires .Cd options APIC_IO . The .Xr mptable 1 command may be used to view the status of multi-processor support. .Sh SEE ALSO .Xr mptable 1 , .Xr condvar 9 , .Xr msleep 9 , .Xr mtx_pool 9 , .Xr mutex 9 , .Xr sema 9 , .Xr sx 9 .Sh HISTORY The .Nm kernel's early history is not (properly) recorded. It was developed 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.
p .Fx 5.0 introduced support for a host of new synchronization primitives, and a move towards fine-grained kernel locking rather than reliance on a Giant kernel lock. The SMPng Project relied heavily on the support of BSDi, who provided reference source code from the fine-grained SMP implementation found in sx . .Sh AUTHORS .An Steve Passe Aq fsmp@FreeBSD.org