Cross-data center RDMA network congestion control method and device based on in-band telemetering

By using in-band telemetry and switch-assisted methods across data center networks, the control loops are subdivided and the rates are dynamically adjusted, solving the problems of excessively long feedback loops and inter-flow unfairness in cross-data center networks, thus achieving more efficient data transmission.

CN122093334APending Publication Date: 2026-05-26COMP NETWORK INFORMATION CENT CHINESE ACADEMY OF SCI
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Patent Information

Application Number
CN202411704403.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing congestion control protocols have excessively long feedback loops in cross-data center network scenarios, leading to queue congestion and flow unfairness. Furthermore, switch-based congestion control protocols are complex to deploy and generally ineffective.

Method used

By employing an in-band telemetry approach, INT information is transmitted between switches via Switch-INT and ACK messages. The control loop is subdivided and the rate is dynamically adjusted in conjunction with a preset congestion control algorithm to achieve fairness and queue management across data center flows.

Benefits of technology

It improves fairness across data center flows, reduces switch queuing time, optimizes data transmission latency, adapts to changes in network conditions, and improves data transmission efficiency.

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Abstract

The invention discloses a cross-data center RDMA network congestion control method and device based on in-band telemetering, and belongs to the technical field of network transmission control. The method comprises the following steps: sending a first cross-data center flow to an upstream DCI switch at an initial rate; according to a Switch-INT message returned by an upstream DCI switch, a first fair rate is calculated, a second cross-data center flow is sent to the upstream DCI switch at the first fair rate, an ACK message of a downstream data center responding to the first cross-data center flow is obtained, and the ACK message comprises a suggested rate; and generating a final rate in combination with the first fair rate and the suggested rate, and sending a third cross-data center flow to an upstream DCI switch at the final rate. According to the method, the network sensing capability of the cross-data center flow can be improved, the fairness of the flow in the data center and the cross-data center flow is improved, and the transmission delay of the datagram is optimized.
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