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by dragontamer
2484 days ago
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AMD is using MDOEFSI, according to page 15 of: https://www.hotchips.org/wp-content/uploads/hc_archives/hc29... However, I can't find any information on what MDOEFSI is. I'm assuming: * Modified
* Dirty
* Owned
* Exclusive
* Forwarding
* Shared
* Invalid Any information I look up comes up to an NDA-firewall pretty quickly (be it in performance counters, or hardware level documentation). It seems like AMD is highly protective of their coherency algorithm. > That'd let you have multiple copies in different slices as long as you weren't mutating them. Seems like the D(irty) state allows multiple copies to be mutated actually. But its still a "multiple copies" methodology. As any particular core comes up to the 8MB (Zen) or 16 MB (Zen2) limit, that's all they get. No way to have a singular dataset with 32MB of cache on Zen or Zen2. |
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