Dynamic PHY Lane Speed Control for Power and Thermal Management
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Solution Overview
Problem
Existing memory sub-systems face challenges in maintaining performance and reducing power consumption due to the increasing power draw and thermal effects associated with higher link speeds in physical host interfaces, particularly in PCIe interfaces, as current power-saving measures are inadequate for varying bandwidth utilization in real-world applications.
Innovation Solution
Dynamically adjusting link speeds of individual lanes within a physical host interface based on real-time bandwidth utilization, allowing for optimized power consumption and efficient energy use by enabling each lane to operate at varying speeds according to demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If link speeds are increased to improve data transmission performance, then bandwidth utilization improves, but power consumption increases
Solution Approach 1:
The patent implements dynamic link speed adjustment by monitoring bandwidth utilization in real-time and adjusting the link speed of individual lanes accordingly. The system transitions from static link speed configuration to dynamic adjustment, where link speeds can vary over time based on actual traffic demands, thereby optimizing the trade-off between performance and power consumption.
Solution Approach 2:
The patent applies different link speeds to different lanes based on their individual utilization patterns. Instead of uniformly adjusting all lanes, the system independently controls each lane's speed according to its specific bandwidth utilization, allowing optimal performance-power trade-off at the lane level rather than forcing a uniform configuration across the entire interface.
2Productivity
If link speeds are increased to improve data transmission performance, then bandwidth utilization improves, but thermal effects worsen
Solution Approach 1:
The system dynamically adjusts link speeds in response to thermal conditions and bandwidth utilization patterns. By monitoring actual traffic demands and adjusting speeds accordingly, the system avoids sustained high-speed operation that generates excessive heat, thereby managing thermal effects while maintaining adequate performance.
Solution Approach 2:
The patent applies thermal management at the lane level by independently controlling the speed of individual lanes. Lanes experiencing high utilization and corresponding thermal generation can be slowed down independently, while other lanes continue operating at higher speeds, thereby distributing and managing thermal effects locally rather than system-wide.
3Use of energy by moving object
If power-saving measures are implemented to reduce power consumption, then energy efficiency improves, but performance capability deteriorates
Solution Approach 1:
The patent implements dynamic power management that adjusts link speeds based on real-time bandwidth utilization monitoring. During low-utilization periods, the system reduces link speeds to save power; during high-utilization periods, it increases speeds to maintain performance. This dynamic approach eliminates the need for static power-saving configurations that would permanently limit performance capability.
Solution Approach 2:
The system changes the operational parameters (link speeds) of the physical interface based on monitored bandwidth utilization. By dynamically adjusting these parameters rather than fixing them at low values for power saving, the system achieves energy efficiency during low-demand periods while preserving full performance capability when needed.
4Use of energy by moving object
If individual lane speed control is implemented to optimize power consumption, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the physical interface into individual controllable lanes, allowing independent speed adjustment for each lane based on its utilization pattern. This segmentation enables fine-grained power optimization at the lane level while using standardized PCIe lane control mechanisms, thereby achieving complex power management goals through modular, manageable units rather than requiring complete system redesign.
Data Source
AI summary
A physical link comprising a set of lanes is configured according to a first lane configuration. In the first lane configuration, a first portion of the set of lanes is disabled and a second portion of the set of lanes serves traffic at a first link speed. A processing device, operatively coupled to the physical link, detects a change to bandwidth utilization of the physical link. In response to detecting the change to bandwidth utilization of the physical link, the processing device configures the set of lanes according to a second lane configuration. In configuring the set of lanes, the processing device configures the first portion of the set of lanes to serve traffic at a second link speed and disables the second portion of the set of lanes.