Unified RDMA Operations for Ordered Data Arrival Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RDMA technologies suffer from inefficiencies due to two-stage operations that consume additional computational and memory resources, reduce network transmission rates, and require reordering of data and arrival indicators, leading to increased latency and bandwidth consumption.
Innovation Solution
Unified RDMA operations that integrate data delivery with explicit or implicit arrival indicator settings, using counting-WRITE, flagged-WRITE, or attribute-WRITE operations, allowing a single transaction to store data and set arrival indicators in the target memory, thereby reducing latency and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-stage RDMA operations are used to deliver data and set arrival indicators separately, then data can be transmitted to target memory, but additional computational resources and memory resources are consumed
Solution Approach 1:
The patent combines data delivery and arrival indicator setting into a single unified RDMA operation. The network controller performs both functions atomically in one transaction, eliminating the need for separate operations to write data to target memory and separately set arrival indicators, thus reducing computational resource consumption while maintaining data delivery reliability
Solution Approach 2:
The unified RDMA operation serves multiple functions simultaneously: it transfers data from source to target memory and automatically updates arrival indicators in the completion queue. This multi-functional approach consolidates what were previously separate operations into a single universal operation that handles both data movement and status notification
2Reliability
If two-stage RDMA operations are used, then data can be stored in target memory, but network transmission rate is reduced
Solution Approach 1:
By merging data transfer and arrival indicator updates into a single atomic operation, the patent eliminates the sequential overhead of two-stage operations. The network controller completes both tasks in one transaction, reducing the total number of operation cycles and improving network transmission throughput while ensuring data is reliably stored in target memory
3Reliability
If separate operations are used for data delivery and arrival indicator setting, then data can be transmitted, but reordering of data and arrival indicators is required
Solution Approach 1:
The unified operation ensures that data delivery and arrival indicator setting occur atomically as a single transaction. This eliminates the need for reordering logic because the arrival indicator is updated only after the data is successfully stored, maintaining proper ordering automatically without additional processing complexity
Solution Approach 2:
The network controller performs the arrival indicator update as part of the same atomic operation that delivers the data, ensuring the indicator is set at the correct moment without requiring subsequent reordering. The operation is structured to complete data transfer first, then immediately update the indicator within the same transaction
4Reliability
If two-stage RDMA operations are used, then data can be written to target memory, but latency is increased
Solution Approach 1:
The patent reduces latency by consolidating two sequential operations into a single atomic unified RDMA operation. The network controller completes both data transfer and arrival indicator updates in one transaction, eliminating the time gap between operations and reducing overall latency while maintaining data writing reliability
5Reliability
If separate RDMA operations are used for data and arrival indicators, then data can be transmitted, but bandwidth consumption is increased
Solution Approach 1:
The unified RDMA operation transmits both data and arrival indicator updates in a single network transaction, eliminating the need for separate operations. This consolidates bandwidth usage, reducing the total amount of network traffic required while ensuring data is reliably transmitted and the arrival indicator is properly updated
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.