On Thu, July 14, 2011 6:56 am, Hamid Reza Khaleghzadeh wrote: > Hi > > I arrived conclusion that data is being sent to the cache which incurred > the > write miss form Patterson book, page 233. when a write miss occurs, > coherency message makes "request data and make P (requester) the exclusive > owner". could you tell me what the meaning of request data is? > > > On Thu, Jul 14, 2011 at 11:34 AM, Nilay <[email protected]> wrote: > >> On Thu, July 14, 2011 1:40 am, Hamid Reza Khaleghzadeh wrote: >> > By the way, I have a question about MOESI-directory protocol. Could >> you >> > tell >> > me when a write miss occurs for an address and this address exists in >> > another cache, why this data read to requested cache and then write >> > operation is done? >> > >> How did you arrive at the conclusion that the data is being sent to the >> cache which incurred the write miss? >>
It could be because the coherence permissions can be fetched speculatively. In case the speculation fails, the data still needs to be around. -- Nilay _______________________________________________ gem5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
