Host-Initiated RDMA Streaming for Direct Memory Sensor Backhaul
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Solution Overview
Problem
Existing technologies face challenges in efficiently processing high-throughput, low-latency data streams from remote sources, particularly due to limitations in scalability and compatibility with RDMA protocols, which require significant logic resources and are infeasible for resource-limited components.
Innovation Solution
A host device initiates a direct-to-memory connection using RDMA stack capabilities, bypassing the operating system, to process data streams from remote sensors through Ethernet or InfiniBand connections, utilizing protocols like RC or UC, and writing data directly to GPU or CPU memory without requiring RDMA support on the remote device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RDMA protocol is implemented on both ends of a connection, then high-throughput and low-latency data transmission is achieved, but device complexity increases due to considerable logic resources required
Solution Approach 1:
The patent introduces a host device as an intermediary that implements the RDMA protocol stack. The host device acts as a mediator between the remote device (which lacks RDMA capabilities) and the memory system, handling all RDMA protocol processing, packet formatting, and memory management operations. This allows resource-limited remote devices to benefit from high-performance RDMA transmission without requiring complex logic resources.
Solution Approach 2:
The host device provides self-service by autonomously managing the complete RDMA transmission process including connection establishment, packet formatting with proper headers, memory allocation, and data transmission coordination. The remote device simply sends data without needing to understand or implement RDMA protocols, as the host device handles all protocol-specific operations independently.
2Productivity
If RDMA protocol stack is implemented on remote devices, then direct memory access capability is achieved, but ease of manufacture decreases due to infeasibility for resource-limited components
Solution Approach 1:
The host device serves as an intermediary that provides RDMA functionality to remote devices that lack native RDMA support. The host device translates simple data send operations from resource-limited remote devices into full RDMA protocol operations, including packet formatting, memory address translation, and direct memory access coordination, making advanced memory access capabilities available without requiring complex remote device hardware.
Solution Approach 2:
The host device provides universal RDMA functionality that can serve multiple types of remote devices with different capabilities. Whether the remote device is a simple sensor, a basic processor, or a specialized component, the host device adapts to provide appropriate RDMA-based memory access, making the system universally applicable across diverse hardware platforms without requiring each device to implement the full RDMA stack.
3Adaptability or versatility
If multiple data streams are processed simultaneously, then scalability is improved, but device complexity increases due to additional connection management requirements
Solution Approach 1:
The host device merges multiple data stream management operations into a unified connection established by the host. Instead of requiring separate complex connection management logic at each remote device, the host device consolidates connection establishment, packet routing, and stream coordination for multiple sensors and data sources, reducing overall system complexity while maintaining multi-stream processing capability.
Solution Approach 2:
The host device acts as an intermediary that manages multiple connections between various remote devices and the memory system. It handles connection establishment, packet formatting, and data routing for multiple simultaneous data streams, abstracting away the complexity of managing multiple RDMA connections from the remote devices themselves.
Data Source
AI summary
Approaches presented herein provide for the real-time backhauling of data streams direct to memory. In at least one embodiment, a host device can initiate a Remote Direct Memory Access (RDMA) transmission with a remote device for sensor data streams. Initialization data for the RDMA transmission can be sent from the host to the remote device, such as over an existing physical Ethernet or InfiniBand (IB) connection. The host device can enter a Ready-to-Receive (RTR) state and send instructions to the remote device to enter a Ready-to-Send (RTS) state. The RDMA transmission can be initialized between the host device and the remote device to transfer streaming data. Using a remote data manager, the streaming data can be sent over the existing Ethernet connection as a RDMA transmission and written directly to allocated memory. The system may be scaled to include higher throughput sensors, additional sensors, and multiple remote transmission devices.