International Business Machines Corporation

Lenovo (singapore) Pte. Ltd.

Rolf Clauberg

Mircea R Gusat

Kenneth Michael Valk

Fredy Daniel Neeser

Nikolaos Chrysos

Patricia Maria Sagmeister

Andreas Christian Doering

Cyriel Johan Minkenberg

Florian Alexander Auernhammer

Johannes G Beha

Armin U Blacha

Hugo K Seitz

Casimer M DeCusatis

Claude Basso

Fabrice Jean Verplanken

Jean Louis Calvignac

Ronald Pete Luijten

Kenneth James Barker

Yiyu L Chen

Andreas Guenther Herkersdorf

Ronald Peter Luijten

David J Webb

Martin L Schmatz

Silvio Dragone

Francois Abel

Maria Gabrani

Daniel Crisan

Wolfgang D Pohl

Christoph S Harder

Heinz Jaeckel

Jonathan Bruno Rohrer

Ernst H Rothauser

Christan Heusch

Rolf B Moeller

Armin U Blancha

A computer-implemented method includes managing function calls between a plurality of nodes and a super node of a rack system having a distributed operating system (OS). The OS includes a plurality of functions divided into first class and a second class, and each of the plurality of nodes excludes functions in the second class. Managing the function calls includes detecting a call to a first function on a first node of the plurality of nodes. It is determined that the first function belongs to the second class of functions and is not available on the first node. The call to the first function is routed to the super node, responsive to determining that the first function belongs to the second class, where the super node includes code for the functions in the second class.

Distributed operating system functions for nodes in a rack

A system for hierarchical occupancy based congestion management includes a buffer embodied in a computer readable storage medium including a plurality of buffer units for storing packets of a data flow received from sources. The system includes a buffer manager that stores information about the packets stored in the buffer, including a selection criterion associated with each of the plurality of sources and a congestion estimator that monitors a congestion level in the buffer. The system also includes a occupancy sampler that randomly selects at least two occupied buffer units from the plurality of buffer units and identifies the source of the packet stored in each of the occupied buffer units and a congestion notification message generator that generates a congestion notification message; wherein if the congestion level in the buffer exceeds a threshold value the congestion notification message is sent to the identified source with a higher selection criteria.

Hierarchical occupancy-based congestion management

A method for hierarchical occupancy based congestion management includes receiving, by a computing device, a plurality of data flows, each of the plurality of data flows is received from a source and includes a plurality of data packets and storing the plurality of data packets in a buffer including multiple storage units. The method includes determining if the buffer is congested, responsive to determining the buffer is congested randomly selecting at least two occupied units of the buffer and identifying a source of each of the data packets stored in the occupied units of the buffer and generating a congestion notification message. The method also includes comparing a selection criterion associated with each identified source to determine which identified source has a higher selection criterion and sending the congestion notification message to the identified source with the higher selection criterion.

A method for hybrid arrival-occupancy based congestion management includes increasing a recent arrivals counter associated with a data flow from one or more sources in response to receiving a data packet from one of the sources and storing the data packet in a buffer including multiple storage units. The method includes determining if a buffer is congested, randomly selecting an occupied unit of the buffer and determining the source of the packet stored in the occupied unit of the buffer, generating a congestion notification message, sending the congestion notification message to the source of the packet stored in the occupied unit of the buffer if the recent arrivals counter exceeds a threshold value and decreasing the recent arrivals counter associated with the source of the packet stored in the occupied unit of the buffer and discarding the congestion notification message if the recent arrivals counter has a zero value.

Hybrid arrival-occupancy based congestion management

A system to improve a Converged Enhanced Ethernet network may include a controller having a computer processor connected to a layer 2 endpoint buffer. The system may also include a manager executing on the controller to monitor the layer 2 endpoint buffer by determining buffer data packet occupancy and/or rate of change in the buffer data packet occupancy. The system may further include a reporter to notify a congestion source of the layer 2 endpoint buffer based upon the buffer data packet occupancy and/or rate of change in the buffer data packet occupancy.

Monitoring endpoint buffer occupancy to determine congestion in an ethernet network

Monitoring endpoint buffer occupancy to determine congestion in an Ethernet network

An address translation unit for Remote Direct Memory Access (RDMA) of a memory of a processor is provided. The address translation unit comprises an address translator and a signer. The address translator is configured to translate a received virtual address in a real address of the memory. The signer is configured to cryptographically sign the real address.

Address translation unit, device and method for remote direct memory access of a memory

A method for Remote Direct Memory Access (RDMA) of a memory of a processor. An address translation unit comprises an address translator and a signer. The address translator is configured to translate a received virtual address in a real address of the memory. The signer is configured to cryptographically sign the real address.

A method for buffer occupancy based congestion management includes receiving, by a computing device, a data stream including a plurality of packets from a plurality of sources and storing the packets in a buffer that includes multiple storage units. The method also includes determining if the buffer is congested, responsive to determining that the buffer is congested randomly selecting an occupied unit of the buffer and determining the source of the packet stored in the occupied unit of the buffer and sending a congestion notification message to the source of the packet stored in the occupied unit of the buffer.

Buffer occupancy based random sampling for congestion management

The present invention relates to a device for combining at least two data signals having an input data rate into a single data stream having an output data rate being higher than the input data rate for transmission on a shared medium or vice versa, particularly, to a single SDH/SONET framer capable of handling a large range of SDH/SONET frames from STM-i to STM-j with an aggregated total capacity corresponding to an STM-j frame where i and j are integers in the range from 1 to 64 or higher according to the STM-N definition of the SDH/SONET standards. More over, the present invention can also be extended to work with STS-1 as lowest range. STS-1 exists in SONET only not SDH and corresponds to a data rate of 51.5 Mb/s a third of the 156 Mb/s of STM-1. The device according to the present invention comprises at least two ports for receiving and/or sending said at least two data signals, a port scanning unit for extracting data from the data signals received by said ports and/or synthesizing data to be transmitted via the ports, respectively, whereby said port scanning unit is configured to extract data from ports providing data streams having at least two different input data rates and/or to synthesize data to be transmitted via the ports taking data streams having at least two different data rates.

STM-1 to STM-64 SDH/SONET framer with data multiplexing from a series of configurable I/O ports

A Resilient Packet Ring (RPR) add/drop device (') supporting plug & play redundancy to connect at least one ring (-), e.g. SDH/SONET ring, to a switch or router device is disclosed. The add/drop device according to the invention comprises two systems (-and-), e.g. Printed Circuit Boards (PCBs). If a failure happens in one of these systems or in a fiber, the whole RPR node comprising these two systems is not affected and the failing system may be changed without perturbation. Each system comprises a framer device and an Add/Drop Multiplexor-Media Access Control (ADM-MAC) device (). In a preferred embodiment, the framer device is a multiplexing framer device that combines at least two RPR data signals having an input data rate into a single data stream having an output data rate being higher than the input data rate for transmission on a shared medium or vice versa. The ADM-MAC device interfaces the multiplexing framer device, the switch or router device and the ADM-MAC device of the other element to provide plug & play redundancy.

Resilient packet ring add/drop device supporting plug and play redundancy

A Resilient Packet Ring (RPR) add/drop device to connect multiple rings, e.g. SDH/SONET rings, wavelength or fibers, to a single switch or router device is disclosed. The add/drop device according to the invention comprises two multiplexing framer devices and an Add/Drop Multiplexor-Media Access Control (ADM-MAC) device. Each of the multiplexing framer devices combine at least two RPR data signals having an input data rate into a single data stream having an output data rate being higher than the input data rate for transmission on a shared medium or vice versa. The ADM-MAC device interfaces the two multiplexing framer devices and the switch or router device.

Multi-ring resilient packet ring add/drop device

A method and a device for combining at least two data signals having a first data rate into a single data stream having a second data rate higher than the first data rate for transmission on a shared medium or vice versa. The device has at least one port for receiving at least two data signals and a port addressing unit for extracting data from the data signals received by the ports. The port addressing unit is configured to place the extracted data at predetermined positions in the single data stream to be transmitted on the shared medium and at least one control data insertion unit is provided for placing control data in the single data stream.

Multiple low-speed into single high-speed SDH/SONET channel mapper/framer device and method

A computer system controls ordered memory operations according to a programmatically-configured ordering class protocol to enable parallel memory access while maintaining ordered read responses. The system includes a memory and/or cache memory including a memory/cache controller, an I/O device for communicating memory access requests from system data sources and a memory controller I/O Interface. Memory access requests from the system data sources provide a respective ordering class value. The memory controller I/O Interface processes each memory access request and ordering class value communicated from a data source through the I/O device in coordination with the ordering class protocol. Preferably, the I/O device includes at least one register for storing ordering class values associated with system data sources that implement memory access requests.

Growing community of inventors

Gattikon, Switzerland

Rolf Clauberg