Command Buffer Management for Storage Device Congestion
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Solution Overview
Problem
Non-volatile storage devices face performance slowdowns due to high latency and bandwidth utilization when handling multiple requests from initiator devices, often resulting in 'busy' messages and retransmissions, leading to monopolization of the command buffer and increased congestion.
Innovation Solution
Implementing a command buffer management module that communicates the remaining allowed storage size to initiator devices, allowing them to delay or avoid sending commands when the buffer is full, thereby reducing instances of monopolization and congestion by indicating available space and using programmable mappings to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the storage device processes a relatively large number of requests from multiple accessing devices, then the storage device can handle more data operations, but the processing speed slows down and latency increases
Solution Approach 1:
The command buffer is divided into multiple segments or regions, with each segment assigned to a specific initiator device. This segmentation allows multiple devices to access different segments simultaneously, reducing contention and latency while maintaining high throughput for multiple requests
Solution Approach 2:
The system pre-allocates command buffer segments to initiator devices before requests arrive. By preparing the buffer structure in advance and assigning segments proactively, the storage device can immediately process incoming requests without waiting for buffer availability, thereby reducing processing latency
2Device complexity
If the storage device returns a busy message to an accessing device when the command buffer is full, then the buffer management is simplified, but the system bandwidth is wasted due to retransmissions
Solution Approach 1:
The command buffer management module continuously monitors buffer availability and provides real-time feedback to initiator devices about the status of their assigned segments. This feedback mechanism allows initiator devices to understand buffer status without causing congestion, eliminating the need for busy messages and retransmissions while maintaining simple buffer management
Solution Approach 2:
Each initiator device is assigned a dedicated segment of the command buffer that it can use independently. The device can autonomously determine when its segment is available and submit commands without needing to query the storage device, thereby eliminating bandwidth-wasting busy messages and retransmissions
3Productivity
If the command buffer is monopolized by a single initiator device, then that device can achieve high throughput, but other initiator devices experience increased latency and reduced performance
Solution Approach 1:
The command buffer is segmented into multiple dedicated regions, with each initiator device assigned a specific segment. This segmentation ensures that one device cannot monopolize the entire buffer, as each device is confined to its own segment. Consequently, each device maintains high throughput within its segment while other devices simultaneously access their own segments without interference, eliminating latency for all initiators
Solution Approach 2:
Each initiator device is granted exclusive access to a specific segment of the command buffer, providing localized high-performance access tailored to that device's needs. This local quality assurance ensures that each device experiences low latency and high throughput within its designated segment, while the overall system maintains fairness and prevents monopolization by any single device
Data Source
AI summary
An electronic device including a communication interface and a command buffer coupled to the communication interface. The communication interface is configured to receive commands from a plurality of initiator devices, and the command buffer is configured to store the commands. The electronic device further includes a command buffer management module coupled to the command buffer. The command buffer management module is configured to generate a message indicating a remaining allowed storage size associated with the command buffer. The communication interface is further configured to enable communication of the message to a particular initiator device of the plurality of initiator devices. The message may enable the particular initiator device to hold off on sending one or more other commands to the command buffer if the remaining allowed storage size fails to satisfy a threshold storage size.