Multi-Mode Indexed Cache to Reduce Processor Conflict Misses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cache systems suffer from conflict misses due to thrashing and poor capacity utilization, leading to inefficiencies in processor performance and power consumption.
Innovation Solution
Implementing a multi-mode indexed cache that dynamically adjusts indexing modes to select different cache sets for memory blocks, using disjoint subsets of memory block addresses to minimize conflict misses without requiring additional cache or circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single indexing mode is used to select cache sets, then the cache structure is simple, but conflict misses increase due to poor capacity utilization
Solution Approach 1:
The patent implements dynamic switching between multiple indexing modes (first indexing mode and second indexing mode) based on cache utilization conditions. The system transitions from a static single-mode indexing structure to a dynamic multi-mode structure that adapts to different operational states, thereby reducing conflict misses without permanently increasing structural complexity
Solution Approach 2:
The patent changes the indexing parameters by selecting different subsets of address bits based on the indexing mode. In the first indexing mode, a first subset of bits is used, while in the second indexing mode, a second subset of bits is used. This parameter change allows the same physical cache structure to achieve better capacity utilization under different conditions
2Reliability
If multiple indexing modes are implemented to reduce conflict misses, then cache hit ratio improves, but device complexity increases
Solution Approach 1:
The patent makes the cache indexing structure universal by enabling it to perform multiple indexing functions through mode switching. The same cache structure can operate in different indexing modes to handle different access patterns, making the system more versatile without requiring separate cache structures for each mode
Solution Approach 2:
The system dynamically selects between indexing modes based on real-time conditions rather than being fixed. This dynamic adaptation allows the cache to optimize its performance for different workloads while using a single unified structure, avoiding the need for multiple dedicated structures
3Reliability
If additional cache structures are added to handle conflict misses, then capacity utilization improves, but power consumption increases
Solution Approach 1:
The patent extracts the conflict resolution function from a potential additional cache structure and implements it through software-controlled mode switching. Instead of adding physical hardware to handle conflicts, the system extracts the resolution logic and implements it through algorithmic approaches (indexing mode selection), thereby avoiding the power consumption of additional hardware
Solution Approach 2:
The cache system serves itself by using existing hardware resources in different configurations rather than requiring additional dedicated structures. The same physical cache can serve different purposes through mode switching, making the system self-sufficient and avoiding the power overhead of extra components
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Various example embodiments for supporting processor capabilities are presented herein. Various example embodiments for supporting processor capabilities may be configured to support a multi-mode indexed cache for a processor. Various example embodiments for supporting a multi-mode indexed cache for a processor may be configured to support a multi-mode indexed cache configured as a set associative cache having a plurality of sets, where the cache is configured to support multiple indexing modes for indexing memory blocks such that, for a memory operation for a memory block, the multiple indexing modes are configured to cause selection of different ones of the plurality of sets of the cache for the memory operation for the given memory block.