Server CPU Frequency Control for Low-Latency Packet Processing
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Solution Overview
Problem
Existing server technologies face challenges in simultaneously achieving low-delay processing and power saving, as conventional CPU frequency adjustment methods fail to accurately predict and adapt to interruption processing, leading to increased power consumption and delays.
Innovation Solution
An in-server frequency control apparatus that preliminarily grasps the start and termination of low-delay services and dynamically adjusts the CPU operating frequency accordingly, increasing it during service initiation and decreasing it upon termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the CPU operates at the highest frequency continuously to curb packet processing delay, then low-delay processing is achieved, but power consumption increases
Solution Approach 1:
The invention uses the task scheduler to predict future packet processing needs and proactively adjusts CPU frequency before actual processing occurs. By analyzing queue depth and predicting load patterns, the system prepares the CPU in advance, avoiding the need for continuous high-frequency operation while ensuring low delay when packets arrive.
Solution Approach 2:
The invention dynamically adjusts CPU frequency based on real-time conditions rather than maintaining a fixed high frequency. The frequency changes from high to low when packet queues are empty, and back to high when packets arrive, creating a dynamic response that balances delay performance with power savings.
2Use of energy by moving object
If the task scheduler dynamically adjusts CPU frequency based on queue depth, then power saving is achieved, but packet processing delay increases
Solution Approach 1:
The invention implements a feedback mechanism where the task scheduler continuously monitors queue depth and adjusts CPU frequency accordingly. When the queue depth exceeds a threshold, the frequency increases; when the queue is empty, the frequency decreases. This closed-loop control ensures the system responds appropriately to actual processing needs.
Solution Approach 2:
The task scheduler predicts future packet arrival patterns based on current queue depth and historical data, allowing it to proactively adjust frequency before packets arrive. This prediction capability enables the system to maintain low frequency most of the time while ensuring high frequency is ready when needed, reducing both delay and power consumption.
Data Source
AI summary
An in-server frequency control apparatus includes a preliminary grasp unit which preliminarily grasps a start of a service requiring low delay in a server and grasps termination of the service by a predetermined method, and an operating frequency change unit which changes an operating frequency of a CPU as a target to be controlled, which is a CPU allocated in advance to a receiver of the service in the server, at the time of the preliminarily grasped start of the service and at the time of the termination of the service. The operating frequency change unit makes the operating frequency of the target CPU higher than a predetermined value at the time of the start of the service and makes the operating frequency of the target CPU lower than the predetermined value at the time of the termination of the service.