Abstract: Serialized broadcast command messaging in a distributed symmetric multiprocessing (SMP) system, including: sending a serial broadcast command from a home chip to a plurality of other chips comprising serial primary chip, wherein each chip of the plurality of other chips comprises a broadcast controller mapped to a home chip broadcast controller; assigning, by the serial primary chip, a tag to the serial broadcast command; sending, from the serial primary chip, to the home chip and a remainder of the plurality of other chips, the tag; and broadcasting, by the home chip and each chip of the plurality of other chips, the serial broadcast command in an order based on the tag of the serial broadcast command.