Editing Bus snooping (section)

{{Short description|Transaction tracker in computer systems}}
'''Bus snooping''' or '''bus sniffing''' is a scheme by which a coherency controller (snooper) in a [[cache (computing)|cache]] (a '''snoopy cache''') monitors or snoops the bus transactions, and its goal is to maintain a [[cache coherence|cache coherency]] in [[distributed shared memory|distributed shared memory systems]].  This scheme was introduced by Ravishankar and Goodman in 1983, under the name "write-once" cache coherency.<ref name=":1">{{Cite book|url=http://www.cs.ucr.edu/~ravi/Papers/NWConf/ravishankar_83.pdf|title=Cache Implementation for Multiple Microprocessors|last1=Ravishankar|first1=Chinya|last2=Goodman|first2=James|date=February 28, 1983|pages=346–350}}</ref> A cache containing a coherency controller (snooper) is called a snoopy cache.