The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2012
Filed:
Apr. 08, 2009
Guy L. Guthrie, Austin, TX (US);
Harmony L. Helterhoff, Cedar Park, TX (US);
Kevin F. Reick, Round Rock, TX (US);
Phillip G. Williams, Leander, TX (US);
Guy L. Guthrie, Austin, TX (US);
Harmony L. Helterhoff, Cedar Park, TX (US);
Kevin F. Reick, Round Rock, TX (US);
Phillip G. Williams, Leander, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In response to a data request of a first processing unit among a plurality of processing units, the first processing unit selects a victim cache line to be castout from the lower level cache of the first processing unit and selects the lower level cache of a second of the plurality of processing units as an intended destination of a lateral castout (LCO) command by randomized round-robin selection. The first processing unit issues on the interconnect fabric an LCO command identifying the victim cache line and the intended destination. In response to a coherence response to the LCO command indicating success of the LCO command, the first processing unit removes the victim cache line from its lower level cache, and the victim cache line is held in the lower level cache of one of the plurality of processing units other than the first processing unit.