Memory Subsystem Program Resume Delay for Read Latency
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Solution Overview
Problem
Conventional memory sub-systems experience increased read operation latency and reduced throughput due to longer program times in mixed write and read workload environments, where read operations are forced to wait for in-progress program operations to complete, negatively impacting Quality of Service (QoS) metrics.
Innovation Solution
Implementing a program suspend operation to pause in-progress write operations in response to read requests, allowing immediate servicing of read operations and establishing a program suspend delay period to optimize operational efficiency and meet QoS targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory sub-system waits for program operations to complete before servicing read operations, then program operation integrity is maintained, but read operation latency increases
Solution Approach 1:
The patent applies preliminary action by checking whether a program operation has completed before allowing a read operation to proceed. This is implemented through the delay period mechanism that proactively prevents read operations from being issued during ongoing program operations, thereby maintaining data integrity while managing read latency through controlled timing
2Reliability
If read operations are queued during program operations, then data integrity is preserved, but throughput decreases
Solution Approach 1:
The patent applies dynamics by making the read operation handling adaptive based on the program operation status. The system dynamically adjusts between immediate read servicing and queuing reads during program operations, with the delay period providing a controlled transition mechanism that optimizes throughput while preserving data integrity
3Loss of time
If program suspend operations are implemented to service read requests immediately, then read latency is reduced, but system complexity increases
Solution Approach 1:
The patent applies periodic action through the implementation of a delay period that is triggered by program resume operations. This periodic mechanism systematically prevents new program operations from being initiated for a specified duration, providing a structured and manageable approach to reducing read latency while controlling system complexity through predictable timing intervals
4Productivity
If a delay period is established after program resume operations, then re-suspension efficiency is improved, but program operation completion time increases
Solution Approach 1:
The patent applies partial action by implementing a delay period that is selectively applied only after program resume operations, not after all program operations. This targeted approach optimizes re-suspension efficiency by preventing unnecessary delays in cases where no read operations are pending, while still providing the efficiency benefits when reads are queued, thereby balancing re-suspension optimization with overall program completion time
Data Source
AI summary
A program operation is executed on a memory sub-system. In response to receiving a request to execute a read operation, executing a first program suspend operation to suspend the program operation. In response to a completion of the read operation, a program resume operation is executed to resume execution of the program operation. A delay period is established following execution of the program resume operation during which execution of the program operation is completed. A second program suspend operation is executed following the delay period.