NVMe Peripheral Device Dynamic Arbitration Queue Monitoring
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Solution Overview
Problem
Current NVMe standard interfaces between peripheral devices and host systems with multiple cores or applications lack efficient arbitration and monitoring mechanisms, leading to suboptimal command processing and resource allocation.
Innovation Solution
Implementing dynamic arbitration parameter adjustment based on submission queue tail movement and priority, allowing for real-time modification of arbitration burst and queue priority for individual submission queues and queue groups, enhancing the NVMe device's ability to manage command processing and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If static arbitration parameters are used in NVMe standard, then device complexity is reduced, but command processing efficiency and resource allocation optimization deteriorate
Solution Approach 1:
The patent implements dynamic arbitration parameters that can be adjusted in real-time based on submission queue tail movement and priority levels. The arbitration mechanism transitions from static to dynamic, allowing burst quantities and priorities to be modified during operation to optimize command processing efficiency across multiple cores and applications.
Solution Approach 2:
The patent changes arbitration parameters such as burst quantity and priority based on monitored queue states. By detecting tail movement in submission queues and adjusting arbitration parameters accordingly, the system optimizes resource allocation without requiring complete redesign of the arbitration mechanism.
2Adaptability or versatility
If real-time monitoring and dynamic adjustment of arbitration parameters is implemented, then resource allocation optimization improves, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent implements a feedback mechanism where the peripheral device monitors submission queue tail movement and uses this information to dynamically adjust arbitration parameters. The monitored queue states provide feedback that triggers parameter changes, enabling adaptive resource allocation based on actual system conditions.
Solution Approach 2:
The arbitration mechanism performs self-adjustment based on monitored queue states without requiring external intervention. The system automatically detects tail movement, evaluates priority levels, and modifies arbitration parameters independently, reducing the need for complex external control mechanisms.
3Speed
If interruption-based command completion is used, then responsiveness to completed commands improves, but processing latency and overhead increase
Solution Approach 1:
The patent implements periodic monitoring of queue states instead of continuous interruption-based notification. By monitoring queue tail movement at intervals and using this information for arbitration decisions, the system reduces the overhead and latency associated with frequent interruptions while maintaining responsive command processing.
Data Source
AI summary
A peripheral device implements a plurality of queue sets each including a submission queue and a completion queue. Changes to the queues are monitored and arbitration parameters are adjusted, the arbitration parameters defining how submission queues are selected for retrieval of a command. An arbitration burst for a submission queue may be increased in response to tail movement for the submission queue being larger than for another submission queue. Priorities used for weighted round robin arbitration may also be adjusted based on tail movement. Arbitration burst quantities and priorities of groups of queues may also be adjusted. Head movement of the completion queues is monitored and may be used to lower priority, enable interrupt coalescing, or pause command retrieval where head movement does not meet a threshold condition.