Memory Response Queue Pacing for Predictable Latency Control
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Solution Overview
Problem
Memory devices face challenges in maintaining predictable and reliable latency performance due to varying access times and bus traffic loads, leading to increased worst-case performance measures and higher average response times.
Innovation Solution
Implementing response completion pacing through a ready response queue with a cadence period and logic timer to control the timing of output communications, adjusting the queue's storage capacity and cadence period to maintain targeted latency and quality of service (QoS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the memory device increases operating speed to reduce response time, then productivity is improved, but signal quality degrades and noise increases
Solution Approach 1:
The patent implements periodic action by introducing a cadence period that periodically spaces out completion response notifications. The controller waits for a specified cadence period between notifications, creating a rhythmic pattern in the output signaling. This periodic spacing allows signal stability during transmission while maintaining controlled response timing, resolving the contradiction between fast response and signal quality.
Solution Approach 2:
The patent applies preliminary action by pre-establishing the cadence period parameter before actual data transmission occurs. The controller is configured with this timing parameter in advance, allowing it to proactively space out notifications rather than reacting to each completion individually. This preliminary timing setup ensures signal quality is maintained from the outset while still achieving predictable response times.
2Productivity
If the memory device increases bus traffic load to improve throughput, then productivity is improved, but worst-case latency increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual time between completion notifications and comparing it against the target cadence period. The controller adjusts its behavior based on this feedback, ensuring that even under high bus traffic conditions, the notification spacing remains within acceptable latency bounds. This feedback mechanism maintains throughput while controlling worst-case latency.
Solution Approach 2:
The patent applies dynamics by making the response timing adaptable rather than fixed. The cadence period is configured to dynamically adjust to varying bus traffic conditions, allowing the system to maintain optimal performance across different load scenarios. This dynamic timing ensures that throughput can be maximized while latency remains controlled under varying conditions.
3Volume of moving object
If the memory device decreases circuit size to meet miniaturization demands, then weight and volume are reduced, but signal quality and consistency deteriorate
Solution Approach 1:
The patent replaces mechanical timing adjustments with electronic software-based cadence control. Instead of physically adjusting circuit components to maintain signal quality in smaller devices, the system uses software-implemented timing mechanisms that space out notifications electronically. This substitution allows miniaturization while maintaining signal consistency through intelligent timing rather than physical constraints.
Data Source
AI summary
Methods, apparatuses and systems related to response completion pacing for latency control are described. The apparatus may utilize response completion pacing to dynamically control timing of output communications to the host. In some embodiments, the memory device can include a ready response queue that temporarily stores the data retrieved from a backend portion or a storage portion of the memory device. The apparatus can include logic coupled to the ready response queue and configured to communicate/send the data in the ready response queue according to a cadence period. In some embodiments, the logic can further dynamically adjust a storage capacity of the ready response queue and/or the cadence period.