Decentralized Multi-Core Power State Synchronization
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Solution Overview
Problem
Current multi-core microprocessor power management systems rely on centralized hardware coordination logic, which can lead to yield-prohibitive die sizes and scaling challenges, especially when many cores are required, and require coordination between multiple processing cores sharing power management resources.
Innovation Solution
A decentralized power management system where each core participates in a de-centralized inter-core power state discovery process using microcode and sideband communication wires, allowing cores to determine and implement composite power states independently without centralized non-core logic, enabling efficient power state management and reduced resource interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized hardware coordination logic is used for power management, then power state coordination between cores is achieved, but die size increases and scalability is limited
Solution Approach 1:
The centralized hardware coordination logic is segmented and distributed to individual cores. Each core now has its own power management capabilities through microcode, eliminating the need for a large centralized coordination unit on the die.
Solution Approach 2:
Power management coordination functionality is extracted from hardware and moved to software (microcode) layer. This removes the need for dedicated hardware coordination logic, reducing die area while maintaining coordination capabilities.
2Reliability
If centralized hardware coordination logic is used for power management, then power state coordination between cores is achieved, but device complexity and scaling challenges increase
Solution Approach 1:
The microcode layer serves multiple functions: it manages power states, handles inter-core communication, and coordinates with the operating system. This universal software layer replaces multiple specialized hardware components, reducing overall system complexity.
Solution Approach 2:
Microcode acts as an intermediary layer between the hardware cores and the operating system. It mediates power management requests, translating OS power requests into core-specific actions, thereby simplifying the interaction complexity.
3Productivity
If cores share power management resources, then resource efficiency is improved, but coordination overhead and interference increase
Solution Approach 1:
Each core is equipped with its own power management microcode that can independently manage its power state. Cores perform self-service power management by autonomously transitioning to appropriate power states without requiring complex coordination protocols, thus maintaining resource efficiency while reducing coordination overhead.
Data Source
AI summary
A multi-core processor includes microcode distributed in each core enabling each core to participate in a de-centralized inter-core state discovery process. In a related microcode-implemented method, states of a multi-core processor are discovered by at least two cores participating in a de-centralized inter-core state discovery process. The inter-core state discovery process is carried out through a combination of microcode executing on each participating core and signals exchanged between the cores through sideband non-system-bus communication wires. The discovery process is unmediated by any centralized non-core logic. Applicable discoverable states include target and composite power states, whether and how many cores are enabled, the availability and distribution of various resources, and hierarchical structures and coordination systems for the cores. The inter-core state discovery process may be carried out in accordance with various hierarchical coordination systems involving chained inter-core communications.