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Write-back: snoop in caches to find most recent copy. • Write Broadcast Protocol: – Write to shared data: broadcast on bus, processors. Assume L1 is a write-back cache. Processor writes to line X (L1 write hit). Line X in L2 cache is in modifed state in the coherence protocol, but it has Lecture 3: Snooping Protocols. • Topics: snooping-based cache coherence implementations Is the protocol simpler for a write-through cache? Interconnect is visible to all processors => snooping technique Snooping Protocols. - A two-state write-through invalidation protocol -.Memory has the latest. – For write-back cache: data in memory is obsoleted. – For snooping protocol, invalidate signals are broadcasted by CPU 0. Bus Snooping Protocols. ❑ Multiple copies are not a problem when reading. ❑ Processor must have exclusive access to write a word. Other caches pick the data off the bus and update their copies (if any). They also raise the SharedLine. The writing cache can determine whether the block is Simple Snooping Protocol. □ Relies on write-through, write no-allocate cache. □ Multiple readers are allowed. □ Writes invalidate replicas.