Date: | Thu, 27 Apr 2006 10:05:49 -0600 |
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From: | "Liqun Cheng" <liqun.cheng@xxxxxxxxx> |
Subject: | Re: [Gems-users] Owner state in MOESI_CMP_directory protocol |
I grab this one, as Mike and Bradford are already overloaded. ;) Owned state is not used to avoid invalidations, it is for reduce (write-back) traffic. In the MESI, a processor needs to update memory when it transitions from Modified to Shared during a snoop request. With Owned state, the processor transitions from Modified to Owned without updating the memory. The memory update is delayed until the line in Owned state is evicted. Owned state can also speedup read request in some protocols where cache-to-cache transfer is allowed for lines in Shared/Owned states. More detailed can be found in Shubu or Milo's Ph.D dissertation. Cheers Legion On 4/27/06, Enric Herrero <enricherrero@xxxxxxxx> wrote: Hi, |
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