I am going out on a limb and say that the kernel does support SMP. It may be that some programs and maybe some drivers are not fully smp.
From your link it states thus.
FreeBSD/i386 runs on a wide variety of “IBM PC compatible” machines. Due to the wide range of hardware available for this architecture, it is impossible to exhaustively list all combinations of equipment supported by FreeBSD. Nevertheless, some general guidelines are presented here....
Symmetric multi-processor (SMP) systems are generally supported by FreeBSD, although in some cases, BIOS or motherboard bugs may generate some problems. Perusal of the archives of the FreeBSD symmetric multiprocessing mailing list may yield some clues."
Last edited by jefro; 09-11-2012 at 03:44 PM.