Date: | Tue, 18 Jul 2006 16:27:07 -0500 |
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From: | Mike Marty <mikem@xxxxxxxxxxx> |
Subject: | Re: [Gems-users] MOESI_SMP_hammer question |
Mike Marty wrote: We added an optimization to the AMD Hammer protocol so that data is not returned twice on any sharing miss. This requires meta-state to the memory controller. It isn't really a directory. If I wasn't clear, the memory controller in the AMD Hammer protocol _always_ responds with Data even if the data is stale. If the data is dirty in a cache, then the requestor will eventually get the dirty data and throw away the stale data. Thus a 2nd data response only happens for dirty sharing misses. You should be able to easily modify the protocol to match what is actually done. |
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