Hello
I have simulated a 8 cores CMP where consists of 4 chips and each chip has 2
cores and one shared L2. MOESI-CMP-directory is coherency protocol.
Core0 Core1 Core2 Core3 Core4 Core5 Core6
Core7
|------------| |------------|
|---------------| |---------------|
| |
| |
L2 __ Dir0 L2 __ Dir1 L2 __ Dir2
L2 __ Dir3
|-------------------------|--------------------------|-------------------------------|
|
Memory
Consider described architecture. Suppose only DL1 of Core2 has data X. At
this point, Core3 (Cores 2 and 3 belong to same ship and have a shared L2)
requests X. There are two approaches for responding to this request:
1- Directory set state of X to SHARE and then read data from L2.
2- Without any access to directory, data read from L2 and state of X doesn't
change.
I think 2 is correct. Could you help me?
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