Adaptive Out-of-Order Arbitration for Virtual Queues
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Solution Overview
Problem
Graphics processing systems experience bottlenecks due to the sequential processing of requests, leading to reduced processing efficiency as requests must wait for earlier requests to be completed before being processed.
Innovation Solution
Implementing a system where requests are mapped to a return queue structure, allowing for out-of-order arbitration by allocating virtual queues based on request needs, and deferring arbitration of partial requests until other queues are processed, ensuring efficient data retrieval and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If requests are processed in the order they are generated or received, then the processing order is simple and easy to manage, but bottlenecks occur and processing efficiency is reduced
Solution Approach 1:
The patent segments the single request processing queue into multiple virtual queues (VQ0-VQ3), each capable of being arbitrated independently. This segmentation allows parallel processing of multiple requests simultaneously, eliminating the sequential bottleneck while maintaining manageable complexity through structured queue organization and arbitration logic.
2Loss of time
If multiple virtual queues are implemented for out-of-order arbitration, then processing time is reduced by allowing ready requests to be arbitrated first, but the system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-allocating multiple virtual queues and establishing arbitration logic before requests arrive. The system proactively sets up the multi-queue structure and arbitration mechanisms in advance, enabling immediate out-of-order processing when requests are received, rather than dynamically creating complexity during request handling.
Solution Approach 2:
The virtual queues serve as intermediary structures between the request source and the processing pipeline. These queues buffer and organize requests, allowing the arbitration logic to selectively process ready requests while deferring others, thus mediating the conflict between maintaining simple processing flow and achieving high processing efficiency.
3Speed
If partial requests are arbitrated immediately, then processing speed is maintained, but deadlocks may occur when resource allocation conflicts arise
Solution Approach 1:
The patent implements dynamic arbitration where the arbitration behavior adapts based on request completeness. Full requests are arbitrated immediately for high speed, while partial requests are dynamically deferred to avoid deadlocks. The system flexibly adjusts processing priorities based on the current state of resource allocation and request status, maintaining both speed and reliability.
Data Source
AI summary
A system includes a memory implementing one or more virtual queues and a processor coupled to the memory. In response to issuing one or more requests for data, a processor maps one or more of the requests for data to a return queue structure. The processor then allocates one or more virtual queues to the return queue structure based on the mapped requests. In response to allocating the virtual queues to the return queue, the processor writes the data indicated in the mapped requests to the allotted virtual queues and enables the return queue for arbitration. When the return queue is enabled for arbitration, the processor reads out the data written to the allocated virtual queues, processes the read out data, and provides the processed data to a processing pipeline.