Directory for multi-node coherent bus
US7725660B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2007 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Nov 10, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0822
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for maintaining cache coherency for a multi-node system using a specialized bridge which allows for fewer forward progress dependencies. A local node makes a determination whether a request is a local or system request. If the request is a local request, a look-up of a directory in the local node is performed. If an entry in the directory of the local node indicates that data in the request does not have a remote owner and that the request does not have a remote destination, the coherency of the data is resolved on the local node, and a transfer of the data specified in the request is performed if required and if the request is a local request. If the entry indicates that the data has a remote owner or that the request has a remote destination, the request is forwarded to all remote nodes in the multi-node system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.