[Gems-users] state transitions in MOESI

["Dave Z." <zhu_dave@xxxxxxxxx>]

Hello,

I have a question regarding the state transitions in MOESI-hammer (perhaps the same scenario exists in other protocols as well). Let's say we have two processors: P0 and P1 that share some data. P0 is the owner, so the data is in O state in P0 and in S state in P1. If P1 tries to write to the data, GETX will be issued. P0 sees the Other_GETX event and sends the data back to P1, right? If so, why is there a need to send the data even though P1 has the data in S state?

Thank you,

Dave




 
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