Victim Cache Write-Miss Handling for Lower Cache Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing computing systems face significant latency in accessing data from memory, which is addressed by incorporating a cache system with a victim cache that reduces overall cache latency and increases efficiency by storing evicted data until it is needed, thereby reducing the number of cycles required for write operations and improving system performance.
Innovation Solution
A cache system with a victim cache that stores evicted data from the main cache, allowing it to service cache misses directly without waiting for the main cache, thereby reducing latency and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a traditional cache system is used without a victim cache, then the cache structure is simpler, but the cache latency increases and write operations require more cycles
Solution Approach 1:
The cache system is segmented into a main cache and a separate victim cache. The main cache handles frequently accessed data while the victim cache specifically stores evicted data that may be needed soon. This segmentation allows the system to reduce latency for specific access patterns without complicating the entire cache structure.
Solution Approach 2:
The victim cache acts as an intermediary between the main cache and lower-level memory. When data is evicted from the main cache, it is redirected to the victim cache instead of being immediately written to lower-level memory. This intermediary structure allows for faster retrieval of recently evicted data, reducing overall cache latency.
2Productivity
If a victim cache is implemented to reduce cache latency, then cache efficiency improves, but the device complexity increases
Solution Approach 1:
The victim cache is designed with specialized functionality tailored to its specific purpose: storing recently evicted data. Rather than making the entire cache system more complex, only the victim cache portion is optimized for this specific function, maintaining high cache efficiency while limiting the increase in overall device complexity.
3Productivity
If evicted data is immediately written back to lower-level memory, then the cache structure is simpler, but the number of write cycles increases and system performance decreases
Solution Approach 1:
The victim cache performs a preliminary action by storing evicted data before it is written to lower-level memory. This preliminary storage allows the system to check if the evicted data is needed again before committing it to slower memory, thereby reducing the number of write cycles needed and improving overall system performance.
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
Methods, apparatus, systems and articles of manufacture to facilitate write miss caching in cache system are described. An example apparatus (110) includes a first cache storage (214); a second cache storage (218), wherein the second cache storage (218) includes a first portion operable to store a first set of data evicted from the first cache storage (214) and a second portion; a cache controller (222) coupled to the first cache storage (214) and the second cache storage (218) and operable to: receive a write operation; determine that the write operation produces a miss in the first cache storage (214); and in response to the miss in the first cache storage (214), provide write miss information associated with the write operation to the second cache storage (218) for storing in the second portion.