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:
Jan. 01, 2013
Filed:
Apr. 09, 2009
Robert A. Cargnoni, Austin, TX (US);
Guy L. Guthrie, Austin, TX (US);
Harmony L. Helterhoff, Austin, TX (US);
William J. Starke, Round Rock, TX (US);
Jeffrey A. Stuecheli, Austin, TX (US);
Phillip G. Williams, Leander, TX (US);
Robert A. Cargnoni, Austin, TX (US);
Guy L. Guthrie, Austin, TX (US);
Harmony L. Helterhoff, Austin, TX (US);
William J. Starke, Round Rock, TX (US);
Jeffrey A. Stuecheli, Austin, TX (US);
Phillip G. Williams, Leander, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In response to a data request, a victim cache line is selected for castout from a lower level cache, and a target lower level cache of one of the plurality of processing units is selected. A determination is made whether the selected target lower level cache has provided more than a threshold number of retry responses to lateral castout (LCO) commands of the first lower level cache, and if so, a different target lower level cache is selected. The first processing unit thereafter issues a LCO command on the interconnect fabric. The LCO command identifies the victim cache line to be castout and indicates that the target lower level cache is an intended destination of the victim cache line. In response to a successful coherence response to the LCO command, the victim cache line is removed from the first lower level cache and held in the second lower level cache.