Hewlett-packard Development Company, L.P.

Hewlett Packard Enterprise Development LP

David L Bernick

Robert L Jardine

James R Smullen

David J Garcia

Pankaj Mehra

William F Bruckert

James S Klecka

Marcelo Moraes De Azevedo

Thomas A Heynemann

Curtis W Landry

Techniques for routing data packets in a networked system. Specifically, a network system and methods of arbitrating data packets in a network system are provided. Switching devices are configured to receive one or more data packets, wherein each of the one or more data packets is received at a respective input port each having a respective input port identification. The routing order of the data packets is determined based on the input port identification corresponding to the respective input port at which each of the data packets is received.

Globally fair polling for packet switched routers using dynamically biased arbitration

Techniques for routing data packets in a networked system. Specifically, a network system and methods of arbitrating data packets in a network system are provided. Switching devices are configured to receive one or more data packets, wherein each of the one or more data packets includes a respective source identification. The source identifications are compared to a source identification history mechanism, and the routing order of the data packets is determined based on the comparison.

Method and apparatus for arbitrating data packets in a network system

Method and system of determining whether a user program has made a system level call and thus whether the user program is uncooperative with fault tolerant operation. Some exemplary embodiments may be a processor-based method comprising providing information from a first processor to a second processor (the information indicating that a user program executed on the first processor has not made a system level call in a predetermined amount of time), and determining by the first processor, using information from the second processor, whether a duplicate copy of the user program substantially simultaneously executed in the second processor has made a system level call in the predetermined amount of time.

Method and system of determining whether a user program has made a system level call

A method and system of loosely lock-stepped non-deterministic processors. Some exemplary embodiments may be a processor-based method comprising executing fault tolerant copies of a user program, one copy of the user program executed in a first processor performing non-deterministic execution, and a duplicate copy of the user program executing in a second processor performing non-deterministic execution, with the executing in the first processor and second processor not in cycle-by-cycle lock-stepped.

Method and system executing user programs on non-deterministic processors

In an implementation of latent error detection, memory regions that each correspond to a different processor element of a redundant processor system are scanned for latent processing errors maintained as erroneous data. The data maintained in the memory regions is compared to detect a latent processing error in a first memory region. The latent processing error is resolved by copying data from a second memory region into the first memory region where the data maintained in the second memory region is determined to be identical to data maintained in at least a third memory region.

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Ben Lomond, CA, United States of America

David L Bernick