Memory Link Power Management for Server Idle States
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Solution Overview
Problem
High capacity memory subsystems in multi-processor servers consume excessive power even when idle, leading to significant idle power consumption, necessitating a reduction in memory subsystem idle power without compromising memory performance or link reliability.
Innovation Solution
Implementing a power management system that detects specific operating conditions to transition memory links and components into low power states, such as clock-gating and self-refresh modes, while optimizing the duty cycle of memory links to conserve power and extend their lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high capacity memory subsystems are implemented in multi-processor servers, then memory capacity and performance are improved, but idle power consumption increases significantly
Solution Approach 1:
The patent implements dynamic power management by transitioning memory links between active and low-power states based on system activity. The memory subsystem dynamically adjusts its operational state, entering low-power modes during idle periods while maintaining full performance during active operations, thus resolving the contradiction between high capacity and idle power consumption
Solution Approach 2:
The patent changes the power state parameter of memory links based on system conditions. By monitoring activity levels and transitioning between different power states (active, idle, low-power), the system maintains high memory capacity while significantly reducing idle power consumption through parameter-based state management
2Use of energy by stationary object
If memory links are frequently power-cycled to reduce idle power, then idle power consumption is reduced, but component lifespan is degraded
Solution Approach 1:
The patent implements periodic power management where memory links transition to low-power states after a threshold period of inactivity. This periodic action reduces idle power consumption while the extended inactivity threshold prevents excessive cycling, thereby protecting component lifespan from degradation
Solution Approach 2:
The patent cushions against excessive power cycling by implementing threshold-based transitions and extended idle periods before entering low-power states. This beforehand cushioning prevents frequent transitions that would degrade memory link lifespan, while still achieving meaningful idle power reduction
3Use of energy by stationary object
If memory links enter low-power states to reduce idle power, then idle power consumption is reduced, but memory performance may be adversely affected
Solution Approach 1:
The patent dynamically transitions memory links between active and low-power states based on real-time system activity monitoring. During active operations, memory links maintain full performance in active state, while during genuine idle periods, they transition to low-power states, thus achieving both power reduction and performance maintenance
Solution Approach 2:
The patent implements feedback mechanisms that monitor system activity and memory access patterns to determine appropriate power states. This feedback ensures that memory links only enter low-power states when truly idle, preventing performance degradation while achieving idle power reduction through intelligent state management
Data Source
AI summary
Embodiments of the invention describe systems and processes directed towards improving link power-management during memory subsystem idle states. Embodiments of the invention control memory link operations when various components of a memory subsystem enter low power states under certain operating conditions. Embodiments of the invention similarly describe exiting low power states for memory links and various components of a memory subsystem upon detecting certain operating conditions.Embodiments of the invention may detect operating conditions in a computing system. Some of these operating conditions may include, but are not limited to, a memory controller being empty of transactions directed towards a memory unit, a processor core executing a processor low-power mode, and a processor socket executing an idle mode. In response to detecting said operating conditions, embodiments of the invention may execute a low-power idle state for the memory unit and various components of the memory subsystem.