GPU Texture Return Buffer for Latency Reduction
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Solution Overview
Problem
Texture operations in graphics processing units (GPUs) face latency issues due to memory access latency, which slows down the graphics processing pipeline.
Innovation Solution
A processor with a texture return buffer and texture units that allocate slots for storing texture values, allowing for efficient storage and retrieval of texture values, reducing the need for direct register allocation and enabling continuous texture operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If texture values are fetched from memory for each pixel, then texture operations can be performed, but memory access latency slows down the graphics processing pipeline
Solution Approach 1:
The texture return buffer pre-allocates slots for texture values before they are needed by the rendering pipeline. Texture units can generate and store texture values in these pre-allocated slots, eliminating the need for threads to wait for memory allocation during critical rendering paths. This preliminary preparation of storage resources reduces latency by ensuring that texture values have ready-made storage locations immediately upon generation.
Solution Approach 2:
The texture return buffer acts as an intermediary between the texture units and the register file allocation system. Instead of texture units directly interacting with the register file (which requires complex allocation and management), they simply write to the buffer's pre-allocated slots. This intermediary layer decouples the texture generation process from the register management process, simplifying the path and reducing latency.
2Ease of operation
If direct register allocation is used for storing texture values, then threads can access texture values, but the complexity of register management slows down processing
Solution Approach 1:
The invention extracts the texture value storage function from the register file system and places it in a dedicated texture return buffer. This separation removes the complexity of register allocation, deallocation, and management from the texture operation path. Threads no longer need to interact with the complex register allocation system for texture values; they simply access the buffer using simpler indexing mechanisms based on texture coordinates.
Solution Approach 2:
The texture return buffer is segmented into multiple slots that can be independently allocated and accessed. Each slot can be addressed by thread ID and texture coordinate, creating a structured access pattern that is simpler than general register management. This segmentation allows parallel access by multiple threads without the contention and complexity of shared register allocation.
3Stability of the object's composition
If texture units wait for register allocation before generating texture values, then register consistency is maintained, but throughput of texture operations decreases
Solution Approach 1:
Slots in the texture return buffer are pre-allocated before texture operations begin. This preliminary allocation ensures that when texture units generate values, storage is immediately available without waiting for register allocation. The pre-established mapping between texture coordinates and buffer slots maintains consistency while enabling continuous operation.
Solution Approach 2:
The texture return buffer enables continuous texture operations by eliminating allocation wait states. Texture units can continuously generate and store values in pre-allocated slots without interruption for register management. This continuous flow maintains system stability while maximizing throughput, as the buffer's structured slots ensure proper ordering and association of texture values with their source coordinates.
Data Source
AI summary
A processor and a system are provided for performing texturing operations. The processor includes a texture return buffer having a plurality of slots for storing texture values and one or more texture units coupled to the texture return buffer. Each of the slots of the texture return buffer are addressable by a thread. Each texture unit is configured to allocate a slot of the texture return buffer when the texture unit generates a texture value.