Nortel Networks Corporation

Keith Clifford Dysart

Peter J Ashwood-Smith

Donald Fedyk

Jerzy Miernik

Gary Kenneth Boon

Mark Dapoz

Peter Joseph Adamovits

Louis Pierre Berube

Greg Waines

France Tremblay

A scheduler of central processing unit (CPU) usage arranges tasks in a plurality of classes, associating a given task with a top level class and a sub-class. Weights may be associated with sub-classes and usage targets associated with top level classes. A target CPU usage may then be determined for the given task from a weight and a target CPU usage. Once an actual usage of the CPU by the given task is determined in a first predetermined evaluation interval, a penalty duration may be determined for the given task based on the actual usage and the target CPU usage. A penalty may then be applied to the given task for the penalty duration during a second predetermined evaluation interval.

CPU usage regulation

A method, apparatus, and system are provided for performing a migration of control over a processing element from an original software system to a replacement software system. A replacement software system in memory associated with an active processing element is configured while an original software system controls the active processing element. The replacement software system is prepared to take control of the active processing element when state information is communicated to it from the original software system. Control of the active processing element is transferred to the replacement software system by a migration manager. A virtual machine may be used to facilitate the transfer of control, by interfacing between the active processing element, the original software system and the replacement software system. The virtual machine and original software system may be deactivated once control is transferred.

Software migration on an active processing element

An apparatus and method of forwarding a first message from a source to a destination via a link state routing network utilizes point-to-point feedback messages when the quality of a first path from the source to the destination meets some prescribed condition. To that end, the first path is initialized within the link state routing network. A feedback message having data relating to a quality of the first path then is received as a point-to-point message that is forwarded to the source. In response to receipt of the feedback message, a second path is initialized from the source to the destination. The first message then is forwarded to the destination via the second path.

Apparatus and method of maintaining timely topology data within a link state routing network

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Stittsville, Canada

Keith Clifford Dysart