International Business Machines Corporation

Lenovo (singapore) Pte. Ltd.

Fredy Daniel Neeser

Mircea R Gusat

Ajay Dholakia

Kenneth Michael Valk

Gordon Taylor Davis

Malcolm Scott Ware

Cyriel Johan Minkenberg

Nikolaos Chrysos

Hua Ye

Dongming Hwang

Youssef Abdelilah

Claude Basso

Jeffrey Haskell Derby

Casimer M DeCusatis

Evangelos Stavros Eleftheriou

Rolf Clauberg

Keshav G Kamble

William Joseph Armstrong

Chih-Jen Chang

Daniel Crisan

Yiyu L Chen

Bernard Metzler

Shay Ben-David

Ayal Zaks

Ronald Peter Luijten

Uzi Shvadron

Robert John Schule

Philip W Frey

Jamie H Moreno

Robert F H Fischer

Thomas Winters Fox

Victor V Zyuban

Ronald Pete Luijten

Jaime Humberto Moreno

Cyriel J A Minkenberg

Charles Robert Young

Kenneth M Walk

Michelle Chan Granholm

DeCusatis M Casimer

IEEE 802.1Q and Enhanced Transmission Selection provide only eight different traffic classes that may be used to control bandwidth in a particular physical connection (or link). Instead of relying only on these eight traffic classes to manage bandwidth, the embodiments discussed herein disclose using an Enhanced Transmission Selection scheduler that permits a network device to set the bandwidth for an individual virtual LAN. Allocating bandwidth in a port based on a virtual LAN ID permits a network device to allocate bandwidth to, e.g., millions of unique virtual LANs. Thus, this technique may increase the granular control of the network fabric and its performance.

Flexible and scalable enhanced transmission selection method for network fabrics

In one embodiment, a method includes receiving a plurality of flows, each flow comprising packets of data and assigning a service credit to each of the plurality of flows. In addition, the method includes assigning a weight parameter to each of the plurality of flows, and selecting a flow from a head of a first control queue unless the first control queue is empty or there is indication that the first control queue should be avoided. A flow is selected from a head of a second control queue in response to a determination that the first control queue is empty or there is indication that the first control queue should be avoided. Additionally, the method includes providing a number of units of service to the selected flow. Moreover, the method includes decreasing the selected flow's service credit by an amount corresponding to the number of units of service provided thereto.

Arbitration of multiple-thousands of flows for convergence enhanced ethernet

Embodiments relate to controlling workload flow on converged Ethernet links. An aspect includes coupling, by a processing device, a first control loop to a second control loop. The second control loop monitors the operation of the first control loop. An equilibrium set point is initialized for the second control loop prior to commencing operation of the first control loop. Accordingly, the equilibrium set point value is adjusted in the second control loop continuously based on a rate of operation of the first control loop.

Adaptive setting of the quantized congestion notification equilibrium setpoint in converged enhanced ethernet networks

Adaptive setting of the quantized congestion notification equilibrium setpoint in converged enhanced Ethernet networks

In one embodiment, a method includes selecting a flow from a head of a first control queue or a second control queue. The method also includes providing service to the selected flow. Moreover, the method includes decreasing a service credit of the selected flow by an amount corresponding to an amount of service provided to the selected flow. In another embodiment, a computer program product includes a computer readable storage medium having program code embodied therewith. The embodied program code is readable/executable by a device to select, by the device, a flow from a head of a first control queue or a second control queue. The embodied program code is also readable/executable to provide, by the device, service to the selected flow, and decrease, by the device, a service credit of the selected flow by an amount corresponding to an amount of service provided to the selected flow.

A reliability system for a Converged Enhanced Ethernet network may include a plurality of end points each comprising a layer 4 transport layer, where each end point is connected to a data center bridging (DCB) layer 2 network. The system may also include an adaptor between the layer 4 transport layer and the DCB layer 2 network to translate at least one of flow and congestion control feedback signals, provided by at least one of the DCB network and the transport layer, to consolidated feedback signals for controlling transmission by the transport layer.

Lossless socket-based layer 4 transport (reliability) system for a converged ethernet network

A method for adjusting a set of primary rate limits for transmission rates of data flows having a certain priority in a transmitter is provided. A mean value is determined of a duty cycle of the certain priority at the port as obtainable from the transmission or flow control, wherein the data flows having different priorities including said certain priority are transmitted by a port of the transmitter, transmissions for rate-limited data flows having the certain priority are limited by secondary rate limits (r', r&#x2032;, . . . r&#x2032;) per data flow, and transmissions for all data flows having the certain priority are controlled by a transmission or flow control per priority. The secondary rate limits (r&#x2032;, r&#x2032;, . . . r&#x2032;) are obtained by adjusting the primary rate limits for the transmission rates of the data flows having the certain priority based on the determined mean value of the duty cycle.

Adjusting rate limits for transmission rates of data flows having a certain priority in a transmitter

In one embodiment, a system includes a processor and logic integrated with and/or executable by the processor, the logic being adapted to: receive a plurality of flows, each flow comprising packets of data, assign a service credit to each of the plurality of flows, assign a weight parameter to each of the plurality of flows, select a flow from a head of a first control queue unless the first control queue is empty or there is indication that the first control queue should be avoided, wherein a flow is selected from a head of a second control queue when the first control queue is empty or there is indication that the first control queue should be avoided, provide a number of units of service to the selected flow, and decrease the selected flow's service credit by an amount corresponding to the number of units of service provided thereto.

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 device for adjusting a set of primary rate limits for transmission rates of data flows having a certain priority in a transmitter is provided, wherein data flows of different priorities including said certain priority are transmitted by a port of the transmitter. The transmission of the data flows having the certain priority is limited by secondary rate limits per data flow and by a transmission or flow control per priority. The device comprises a determiner and a number of adjusters. The determiner is configured to determine a mean value of a duty cycle of the certain priority at the port provided by the transmission or flow control. The adjusters are configured to adjust the primary rate limits for the transmission rates of the data flows having the certain priority based on the determined mean value of the duty cycle to obtain the secondary rate limits.

Device and method for adjusting rate limits for transmission rates of data flows having a certain priority in a transmitter

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

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Langnau am Albis, Switzerland

Fredy Daniel Neeser