2018年4月23日 · Choice of MESIF vs. MOESI can be influenced by other design factors; Intel's use of a large tag-inclusive L3 shared cache as a backstop for coherency traffic is their solution to the same problem that MOESI solves: traffic between cores is handled efficiently with write-back to L3 then sending the data from L3 to the requesting core, in the ...

2015年8月7日 · So looking for the different cache-coherence-protocol-types I have come across on Wikipedia that Intel has developed the MESIF cache-coherence-protocol, but there is no information that Intel also uses this. Looking at the manual Intel® 64 and IA-32 Architectures Developer's Manual: Vol. 3A I couldn't find anything about MESIF but the MESI ...

2018年4月29日 · What is the benefit of the MOESI cache coherency protocol over MESI? 6

2011年5月15日 · The details on how these two operations happen depend on how the cache coherence protocol is implemented.. snooping or directory. Note that in the above case there's no data transfer from Processor A/memory to Processor B, because Processor B already has the data (and should be the latest).

2016年10月23日 · Can cache coherency protocols like snooping coherence protocol and MESI/MOESI be implemented in hardware(RTL)? I am designing an RTL for multicore cache environment, and need to implement the cache coherency protool in that to get coherent and consistent data for all the processors. This is just an academic exercise. Any leads would …

The MESI protocol doesn't allow more than one caches to keep the same cache line in a modified state. So, if one cache line is modified and wants to be read from other processor´s cache, then it must be first written to main memory and then read, so that both processor´s caches now share that line (shared state)

2015年8月2日 · In the state transition diagram shown below for the Illinois MESI protocol, why is there a Flush' signal when transitioning from state S to state I and a Flush signal when going from state E to state I upon observing a BusRdX signal. Wouldn't the cache content for processors in these states be the same as the content in main memory?

2014年1月15日 · (By the way, the MESI protocol given by that book is a bit unusual. It is more common for Exclusive state to be entered by a read miss that found no other caches with the block [this allows silent update to modified on a later write] and for writes not to use write through to memory on a hit that was in shared state.)

2014年11月16日 · Adding an Owned (MOESI) or Forwarding (MESIF) state can delay this writeback (and in theory "ownership" of a dirty block could be transferred to further delay writeback but that increases complexity and cache coherence is already one of the "two hard problems in computer science"). –

2014年12月6日 · If I may start with an example. Say we have a system of 4 sockets, where each socket has 4 cores and each socket has 2GB RAM ccNUMA (cache coherent non-uniform memory access) type of memory.