Editing Bus snooping (section)

== Drawback ==
The disadvantage of bus snooping is limited [[scalability]]. Frequent snooping on a cache causes a race with an access from a processor, thus it can increase cache access time and power consumption.  Each of the requests has to be broadcast to all nodes in a system. It means that the size of the (physical or logical) bus and the [[Bandwidth (computing)|bandwidth]] it provides must grow, as the system becomes larger.<ref name=":0" /> Since the bus snooping does not scale well, larger [[cache coherent NUMA]] (ccNUMA) systems tend to use [[directory-based coherence protocols]].