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The MESI protocol adds an "Exclusive" state to reduce the traffic caused by writes of blocks that only exist in one cache. The MOSI protocol adds an "Owned" state to reduce the traffic caused by write-backs of blocks that are read by other caches.
This protocol is equivalent to the RT-MESI protocol for system with multi L2 cache on multi-module systems; S L - "Shared Last" equivalent to R on RT-MESI; Me - "Valid Exclusive" = E; Mu – unsolicited modified state - special state – asking for a reservation for load and store doubleword (for 64-bit implementations)
The MESIF protocol is a cache coherency and memory coherence protocol developed by Intel for cache coherent non-uniform memory architectures. [1] The protocol consists of five states, Modified (M), Exclusive (E), Shared (S), Invalid (I) and Forward (F). [2] The M, E, S and I states are the same as in the MESI protocol. The F state is a ...
The MESI protocol is an invalidate-based cache coherence protocol, and is one of the most common protocols that support write-back caches. It is also known as the Illinois protocol due to its development at the University of Illinois at Urbana-Champaign. [1] Write back caches can save considerable bandwidth generally wasted on a write through ...
The MOSI protocol is an extension of the basic MSI cache coherency protocol. It adds the O wned state, which indicates that the current processor owns this block, and will service requests from other processors for the block.
Modified Owned Exclusive Shared Invalid (MOESI) is a full cache coherency protocol that encompasses all of the possible states commonly used in other protocols. In addition to the four common MESI protocol states, there is a fifth "Owned" state representing data that is both modified and shared. This avoids the need to write modified data back ...
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