Decomposed switch control path with direct connection scheduling

By employing pass-through interface technology in the server host accelerator system, the transmission paths of data and configuration packets are separated, solving the latency and bandwidth issues in PCIe and CXL topologies, and achieving low-latency, high-bandwidth data transmission and hot-plugging capabilities.

CN115836282BActive Publication Date: 2026-06-12XILINX INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XILINX INC
Filing Date
2021-02-18
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

In existing technologies, PCIe and CXL topologies of server host accelerator systems suffer from increased latency, reduced bandwidth, and inefficient switch resources due to their tree-like topology, especially under cache coherence protocols.

⚗Method used

By employing a pass-through interface technology, the transmission paths of data packets and configuration packets are separated. Data packets bypass the embedded switch via a direct path, while configuration packets are forwarded through the switch, thus avoiding the impact of the switch's bandwidth, resources, and latency.

🎯Benefits of technology

It reduces latency, improves bandwidth utilization, and enhances system performance, especially by reducing latency during cache consistency operations, and supports software compatibility for hot-plugging and configuration operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

Embodiments herein describe techniques for separating data transmitted between I / O function blocks in an integrated assembly and a host into separate data paths. In one embodiment, data packets are transmitted using a direct data path that bypasses a switch in the integrated assembly. In contrast, configuration packets (e.g., hot swap, hot add, hot remove data, certain types of descriptors, etc.) are transmitted to the switch, which then forwards the configuration packets to their targets. The direct path of data packets does not rely on switch connectivity (and its attendant latency) to transmit bandwidth sensitive traffic between the host and the I / O function blocks, but rather avoids (e.g., bypasses) the bandwidth, resource, store / forward, and latency attributes of the switch. At the same time, by using the switch to provide the configuration data path, software compatibility attributes, such as hot plug attributes, which are not latency or bandwidth sensitive, continue to be supported.
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