Unified RDMA Operations for Latency Reduction
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Solution Overview
Problem
Existing RDMA technologies face inefficiencies due to additional computational and memory resources required for second requests and completion flag propagation, leading to increased latency and reduced network transmission rates.
Innovation Solution
The implementation of unified RDMA operations, such as counting-WRITE and flagged-WRITE operations, which allow for the delivery of data with explicit or implicit instructions to set or update an arrival indicator upon partial or complete transfer, reducing the need for separate requests and operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional RDMA operations with separate completion flag propagation are used, then data transfer can be achieved, but additional computational resources and memory resources are required, leading to increased latency and reduced network transmission rates
Solution Approach 1:
The patent merges the data transfer operation and the completion flag update operation into a single unified RDMA operation. The network controller performs both the data write to target memory and the arrival indicator update in one atomic operation, eliminating the need for separate completion flag propagation and reducing computational overhead.
Solution Approach 2:
The unified RDMA operation serves multiple functions simultaneously: it transfers data from source to target memory, updates the arrival indicator to signal data completion, and manages memory resources all through a single operation interface, making the system more efficient and reducing the number of separate computational steps required.
2Loss of time
If traditional RDMA operations with separate completion flag propagation are used, then data transfer can be achieved, but latency is increased due to additional requests and operations
Solution Approach 1:
The patent combines multiple sequential operations (data transfer request, completion flag update request) into a single unified RDMA operation. This merging eliminates the time required for separate request processing and execution, directly reducing latency while maintaining data transfer integrity.
Solution Approach 2:
The unified operation is designed to perform the arrival indicator update as part of the data transfer operation itself, rather than as a subsequent separate action. This preliminary integration ensures that the completion signaling is prepared and executed concurrently with data transfer, minimizing waiting time.
3Reliability
If additional requests and operations are used for completion flag propagation, then data arrival can be signaled, but network and local bus performance are reduced
Solution Approach 1:
The patent merges the data transfer and arrival indication functions into a single unified operation that travels through the network and local bus only once. This eliminates redundant traffic from separate completion flag propagation, reducing network and bus utilization while ensuring reliable data arrival signaling through the integrated arrival indicator.
Data Source
AI summary
Disclosed are apparatuses, systems, and techniques that improve efficiency and decrease latency of remote direct memory access (RDMA) operations. The techniques include but are not limited to unified RDMA operations that are recognizable by various communicating devices, such as network controllers and target memory devices, as requests to establish, set, and/or update arrival indicators in the target memory devices responsive to arrival of one or more portions of the data being communicated.