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:
Jun. 20, 2006
Filed:
Mar. 22, 1999
Kenneth J. Duda, Hillsborough, CA (US);
David R. Cheriton, Palo Alto, CA (US);
Kenneth J. Duda, Hillsborough, CA (US);
David R. Cheriton, Palo Alto, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
The present invention includes a scheduling mechanism that fairly allocates a resource to a number of schedulable elements of which some are latency-sensitive. The invention tracks each element's use of the resource by determining the element's virtual time. An active element is selected from the elements that are ready to use the resource by determining the element that has the smallest effective virtual time. The effective virtual time is the element's actual virtual time modified by a borrowed virtual time value. When an element has a short-term need for the resource, it can borrow the privilege to run by borrowing virtual time. As the element uses the resource, it consumes virtual time according to its weight. When the elements are scheduled for the resource, the ready elements having the smallest virtual time is selected. The invention enforces long-term fairness to each element while allowing latency-sensitive elements to be preferably selected.