CAM Shadow RAM for Order Scope Transition Throughput
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Solution Overview
Problem
The throughput and utilization of content-addressable memory (CAM) in multi-core processing systems are limited due to the need for sequential operations during order scope transitions, which affects the overall efficiency of task switching and processing multiple tasks concurrently.
Innovation Solution
Incorporating a Random Access Memory (RAM) to shadow the CAM data, allowing only write and compare operations to be performed in the CAM, while read operations are offloaded to the RAM, thereby reducing the latency and increasing the throughput of the CAM module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If read operations are performed in the CAM module during order scope transitions, then the current scope and match information can be retrieved, but the throughput and utilization of the CAM module are limited due to sequential operations
Solution Approach 1:
A shadow RAM is introduced as an intermediary component that stores a copy of the scope data from CAM. The shadow RAM handles all read operations for scope information, while the CAM module is exclusively used for write operations and match comparisons. This mediator approach allows the CAM to operate at full speed without being bottlenecked by sequential read operations, thereby resolving the throughput limitation while maintaining accurate scope matching.
Solution Approach 2:
Read operations are extracted from the CAM module and relocated to the shadow RAM. By removing the read function from the CAM, the module can focus solely on its high-speed write and compare operations. This extraction eliminates the sequential operation bottleneck that was limiting CAM throughput, as the shadow RAM independently handles all read requests without interfering with CAM's primary functions.
2Reliability
If multiple operations (read, write, compare) are performed sequentially in the CAM module, then all necessary operations can be completed, but the latency increases and throughput decreases
Solution Approach 1:
The shadow RAM serves as a mediator that handles read operations in parallel with CAM's write and compare operations. Instead of performing read, write, and compare operations sequentially in the CAM, the system now performs reads from shadow RAM simultaneously with CAM writes and compares. This parallel execution through the intermediary shadow RAM reduces overall operation latency while ensuring all operations are completed reliably.
Solution Approach 2:
The shadow RAM is pre-loaded with scope data from CAM before read operations are needed. By performing the data copying action in advance (when CAM writes new scope information), the system prepares the shadow RAM with up-to-date scope data without requiring time-consuming reads from CAM during critical transition periods. This preliminary action reduces the latency of subsequent read operations.
3Adaptability or versatility
If the CAM module handles all operations (read, write, compare), then complete functionality is achieved, but the utilization efficiency is reduced due to idle cycles during read operations
Solution Approach 1:
Read operations are extracted from the CAM module and assigned to the shadow RAM. This extraction allows the CAM to maintain its complete functionality for write and compare operations while eliminating idle cycles that occurred during read operations. The shadow RAM independently handles all read requests, ensuring the CAM remains fully utilized for its primary functions without experiencing downtime, thereby improving overall utilization efficiency while preserving complete operational functionality.
Solution Approach 2:
The shadow RAM is designed to be a multi-functional component that handles all read operations for scope information, effectively serving as a dedicated read interface for the CAM system. This universal read handler allows the CAM module to focus exclusively on write and compare operations, optimizing its utilization efficiency. The shadow RAM's multi-functionality in handling various read requests ensures complete operational functionality is maintained while the CAM operates at peak efficiency.
Data Source
AI summary
A data processing system includes a content addressable memory (CAM). Each entry of the CAM corresponds to a task and is configured to store a current scope of each task. A random access memory (RAM) is configured to shadow information of the CAM. Transition position storage circuitry is configured to store transition age positions for tasks. Control circuitry is configured to, in response to a command to transition a selected task to a destination scope, access the RAM to determine the current scope for the selected task, use the current scope to perform a match determination with the CAM to determine if any entries corresponding to tasks other than the selected task match the current scope; and for any matching entries, updating a transition age position in the transition position storage circuitry for the corresponding task within the current scope.