L2 Cache Bank Swizzle for Texture Collision Reduction
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Solution Overview
Problem
Graphics processing systems face performance issues due to memory latency and bank collisions in texture data access, which are not adequately addressed by existing texture caching solutions.
Innovation Solution
Implementing a bank swizzle operation within the L2 cache to remap texture data, increasing the distance between banks with the same index and reducing the likelihood of bank collisions, thereby optimizing data retrieval efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If texture data is stored in a conventional linear bank arrangement in the L2 cache, then the cache structure is simple and easy to implement, but bank collisions occur frequently when fetching texture data, increasing memory latency and reducing graphics processing performance
Solution Approach 1:
The patent applies a bank swizzle operation that remaps texture data banks from a linear arrangement to a two-dimensional grid pattern. This dimensional transformation increases the distance between banks with the same index, reducing bank collisions during texture filtering operations while maintaining manageable cache structure complexity through systematic remapping patterns.
2Device complexity
If texture data is accessed directly from system memory, then the memory structure remains simple, but memory latency is excessive and shared system bus contention increases data access time
Solution Approach 1:
The patent implements a texture cache that pre-fetches and stores texture data from system memory before it is needed for rendering operations. This preliminary action moves texture data into the L2 cache in advance, reducing memory latency and eliminating shared system bus contention during actual texture processing, thereby significantly reducing data access time.
3Productivity
If a texture cache is implemented to store texture data, then memory latency is reduced and data accessibility is improved, but bank collisions still occur in the L2 cache, causing cache thrashing and performance degradation
Solution Approach 1:
The patent remaps the L2 cache banks from a linear one-dimensional arrangement to a two-dimensional grid pattern using the bank swizzle operation. This dimensional change increases the physical distance between banks that access the same texture data, preventing bank collisions and cache thrashing while maintaining high data accessibility and cache performance stability.
Data Source
AI summary
Systems and methods for graphics data management are described. One embodiment includes a method for reducing bank collisions within a level 2 (L2) cache comprising the following: reading texture data from external memory configured to store texture data used for texture filtering within the graphics processing unit, partitioning the texture data into banks, performing a bank swizzle operation on the banks, and writing the banks of data to the L2 cache.