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In computing, the MSI protocol - a basic cache-coherence protocol - operates in multiprocessor systems. As with other cache coherency protocols, the letters of the ...
MSI is not supported in earlier versions like Windows XP or Windows Server 2003. [15] Solaris Express 6/05 released in 2005 added support for MSI an MSI-X as part of their new device driver interface (DDI) interrupt framework. [16] FreeBSD 6.3 and 7.0 released in 2008 added support for MSI and MSI-X. [17] OpenBSD 5.0 released in 2011 added ...
This method ensures that only one copy of a datum can be exclusively read and written by a processor. All the other copies in other caches are invalidated. This is the most commonly used snooping protocol. MSI, MESI, MOSI, MOESI, and MESIF protocols belong to this category.
Protocol MOESI type – Data stored in M (D) or in O (SD) and the other caches in S (V) – Data is sent to the requesting cache from the "owner" M (D) or O (SD). The requesting cache is set S (V) while M (D) is changed in O (SD). – The MM is not updated. Protocols MESI type and MEI – Data stored in M (D) and the other caches in S (V) state
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.
The most striking difference between MESI and MSI is the extra "exclusive" state present in the MESI protocol. This extra state was added as it has many advantages. When a processor needs to read a block that none of the other processors have and then write to it, two bus transactions will take place in the case of MSI. First, a BusRd request ...
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In computing, MOESI ("Modified Owned Exclusive Shared Invalid") 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 ...