Google Interview Question for Systems Design Engineers


Country: United States
Interview Type: In-Person




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I understand that MOESI is for L1 caches, what is the typical protocol for L2C?

- lou October 27, 2015 | Flag Reply
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My answer was: suppose L2 received CPU0 req first, then in the end the result would be: DRAM=100, L2C=0(dirty), L1-CPU0=0(inval), L1-CPU1=1(modified) .

- lou October 28, 2015 | Flag
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Dram = 0
L2 = 0
L1cpu0 = 0(invl)
L2cpu1 = 1(m)
Upon busrdx flush cache
If flush to l2 only it will be dirty

- Comparchenthu November 19, 2015 | Flag Reply


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