Exclusive ownership snoop filter
US7581068B2 · kind B2 · utility
4Cited by
0References
20Claims
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Assignee
Inventors
Key dates
| Filing date | Jun 29, 2006 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Dec 30, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0833
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A snoop filter maintains data coherency information for multiple caches in a multi-processor system. The Exclusive Ownership Snoop Filter only stores entries that are exclusively owned by a processor. A coherency engine updates the entries in the snoop filter such that an entry is removed from the snoop filter if the entry exits the exclusive state. To ensure data coherency, the coherency engine implements a sequencing rule that decouples a read request from a write request.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.