Memory Controller Workload Management via Delayed Completion Responses
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Solution Overview
Problem
In memory systems, the existing technologies face challenges in managing workload imbalances between foreground and background operations, leading to difficulties in providing timely completion responses to hosts, which affects the quality of service, especially when the background operation workload exceeds the foreground workload and available buffer capacity is insufficient.
Innovation Solution
A controller with a host interface that determines a delay amount of time based on free and estimated-required buffer sizes, and a processor that sets a background flag to compare workloads, allowing for delayed completion responses when the background operation workload is greater, thereby managing buffer capacity and ensuring timely responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the controller prioritizes background operations when workload is high, then background operation completion is improved, but host response time deteriorates
Solution Approach 1:
The controller dynamically adjusts the completion response timing based on real-time workload conditions. When background operation workload exceeds host write operation workload, the controller delays the completion response to the host interface, allowing background operations to complete first. This dynamic adjustment resolves the contradiction by making the system flexible in prioritizing operations based on current workload states.
Solution Approach 2:
The controller determines the workload comparison between background and host operations in advance before issuing completion responses. By pre-assessing the workload conditions and proactively delaying completion responses when background operations are heavy, the controller ensures that background operations can complete without being interrupted by host response requirements, thus improving background operation completion while managing host response timing.
2Reliability
If the controller delays completion responses during high background workload, then quality of service is improved, but buffer capacity requirements increase
Solution Approach 1:
The controller changes the timing parameter of completion responses based on workload conditions. Instead of immediately issuing completion responses, the controller delays them when background workload is high, effectively changing the time parameter of response delivery. This parameter change allows the system to maintain quality of service by ensuring background operations complete successfully while managing buffer usage through controlled response timing.
3Speed
If the controller processes host write operations immediately, then host response time is reduced, but background operation workload increases
Solution Approach 1:
The controller implements a feedback mechanism by continuously monitoring the workload of background operations versus host write operations. Based on this feedback, the controller decides whether to delay completion responses to the host interface. When background workload is detected to be high, the controller feeds back this information by delaying the completion response, thereby preventing further increase in background workload while still maintaining acceptable host response times.
Data Source
AI summary
Disclosed are a controller that controls a memory device, and an operating method of the controller. The controller may include a host interface suitable for fetching a write command received from a host; and a processor suitable for controlling a write operation of the memory device in response to the fetched write command, wherein, when a workload of a background operation of the processor is greater than a workload of a host write operation, the host interface is further suitable for: determining a delay amount of time and providing the host with a completion response to the write command after delaying the completion response by the delay amount of time.