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:
Aug. 09, 2005
Filed:
Aug. 30, 2000
Donald C. Englin, Shoreview, MN (US);
Donald W. Mackenthun, Fridley, MN (US);
Kelvin S. Vartti, Hugo, MN (US);
Donald C. Englin, Shoreview, MN (US);
Donald W. Mackenthun, Fridley, MN (US);
Kelvin S. Vartti, Hugo, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A method of and apparatus for improving the efficiency of a data processing system employing a multiple level cache memory system. The efficiencies result from enhancing the response to SNOOP requests. To accomplish this, the system memory bus is provided separate and independent paths to the level two cache and tag memories. Therefore, SNOOP requests are permitted to directly access the tag memories without reference to the cache memory. Secondly, the SNOOP requests are given a higher priority than operations associated with local processor data requests. Though this may slow down the local processor, the remote processors have less wait time for SNOOP operations improving overall system performance.