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 Title: |
US6883070:
Bandwidth-adaptive, hybrid, cache-coherence protocol
[ Derwent Title ]
>> View Certificate of Correction for this publication
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| Country: |
US United States of America
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| Inventor: |
Martin, Milo M. K.; Madison, WI, United States of America
Sorin, Daniel J.; Madison, WI, United States of America
Hill, Mark D.; Madison, WI, United States of America
Wood, David A; Madison, WI, United States of America
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| Assignee: |
Wisconsin Alumni Research Foundation, Madison, WI, United States of America
other patents from WISCONSIN ALUMNI RESEARCH FOUNDATION (631280) (approx. 1,178)
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| Published / Filed: |
2005-04-19
/ 2001-10-19
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| Application Number: |
US2001000037727
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| IPC Code: |
Advanced:
G06F 12/08;
Core:
more...
IPC-7:
G06F 12/08;
G06F 15/167;
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| ECLA Code: |
G06F12/08B4P;
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| U.S. Class: |
711/141;
711/146;
711/207;
709/224;
709/230;
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| Field of Search: |
711/141,144-146,3,205,207
710/104-105,240
709/213,216,253,230,245,224,239,225
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| Government Interest: |
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
This invention was made with United States government support awarded by the following agencies:
NSF 9971256
The United States has certain rights in this invention.
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| Priority Number: |
| 2001-10-19 |
US2001000037727 |
| 2001-03-14 |
US2001000275743P |
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| Abstract: |
A cache coordination mechanism for a multiprocessor, shared-memory computer switches between a snooping mechanism where an individual processor unit broadcasts or multicasts cache coherence messages to each other node on the system and a directory system where the individual processor unit transmits the cache control message to a directory which then identifies potential candidates to receive that message. The switching is according to the activity on the communication network used by the cache coherence messages. When network activity is high, a directory protocol is used to conserve bandwidth but when network activity is low, a snooping system is used to provide faster response.
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| Attorney, Agent or Firm: |
Quarles & Brady LLP ;
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| Primary / Asst. Examiners: |
Tran, Denise;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of provisional application No. 60/275,743 filed Mar. 14, 2001.
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| Family: |
Show 3 known family members
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First Claim:
Show all 32 claims |
1. A method of coordinating at least two processor units, each having a processor and cache memory, and communicating cache coherence messages with each other and a shared memory over a network, the method comprising the steps of: (a) providing a mechanism for communications of cache coherence messages directly from a given processor unit to another processor unit; (b) providing a mechanism for communication of cache coherence messages directly from a given processor unit to a directory and then to at least one other processor unit when indicated by the directory; (c) evaluating the available bandwidth on the network used to communicate the cache coherence messages; and (d) for a given cache coherence message, selecting one the mechanism of step (a) or the mechanism of step (b) based on the evaluation of step (c).
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 6 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS C2003-057730
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| Other References: |
Scott et al., “Performance of Pruning-Cache directories for large-Scale Multiprocessors” 1993, IEEE, vol. 4, No. 5, pp 520-534.*
(15 pages)
Cited by 11 patents
[ISI abstract]
Bilir, E. Ender et al., Multicast Snooping: A New Coherence Method Using a Multicast Address Network, ISCA'99 Submission, University of Wisconsin—Madison, pp. 1-22, May 2-4, 1999.
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| Continuity Data: |
| Application Number | Filed | Notes |
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US2001000037727 | 2001-10-19 | is a
related to the prior publication |
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US20020133674A1 issued 2002-09-19 Bandwidth-adaptive, hybrid, cache-coherence protocol
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US2001000037727 | 2001-10-19 | is a
non-provisional of provisional |
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US2001000275743P
| 2001-03-14 |
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US2005000063294 | 2005-02-22 | is a
division of |
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>US2001000037727<
| 2001-10-19 |
(granted)
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US6883070 issued 2005-04-19 Bandwidth-adaptive, hybrid, cache-coherence protocol
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