Out-of-order buffer request sequence table management
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Solution Overview
Problem
Existing buffer management methods, such as FIFO queues, are not applicable to out-of-order buffers, where the sequence of transmitting requests is not related to the sequence of receiving requests, necessitating an effective method to record and manage the sequence of requests in an out-of-order queue.
Innovation Solution
An out-of-order buffer with a request sequence table and a request storage device, where the controlling circuit uses an allocate controller, a deallocate controller, and a dispatch controller to manage the storage and transmission of requests, utilizing a request sequence table with m×n indicating units to record the storage sequence and status of requests, allowing for efficient allocation and deallocation of storage units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a FIFO queue is used to manage buffer requests, then the management method is simple and easy to implement, but it cannot be applied to out-of-order buffers where transmission sequence differs from reception sequence
Solution Approach 1:
The buffer management system is segmented into multiple independent components: a request sequence table with m entry indicating rows and n indicating units per row, m storage units for requests, and separate controllers for allocation, deallocation, and dispatch. This segmentation allows the system to track sequences independently for each storage unit while maintaining overall out-of-order transmission capability.
Solution Approach 2:
The request sequence table acts as an intermediary data structure between the out-of-order queue and the controlling circuit. It records both the storage sequence and status of requests without requiring the queue itself to maintain sequence information, thereby decoupling the transmission order from the storage order while enabling sequence tracking.
2Loss of information
If the request sequence table uses m×n indicating units to track storage sequence, then sequence recording becomes effective for out-of-order transmission, but the device complexity increases
Solution Approach 1:
Each of the m entry indicating rows contains n indicating units that locally track the status and sequence information for specific storage units. This local quality approach allows sequence information to be distributed across multiple rows rather than centralized, reducing the complexity burden on any single part of the table while maintaining complete sequence tracking capability.
Solution Approach 2:
The request sequence table uses a two-dimensional structure with m entry indicating rows and n indicating units per row, transforming a potentially complex one-dimensional tracking problem into a more manageable multi-dimensional structure. This dimensional organization allows efficient encoding of sequence information where each row can represent different aspects of request status.
3Quantity of substance
If all storage units are used, then buffer capacity is maximized, but new requests must be blocked until space is available
Solution Approach 1:
The system implements feedback mechanisms where the controlling circuit continuously monitors the status of all m storage units through the request sequence table. When storage units are freed through retirement of completed requests, the feedback signal triggers immediate reallocation to waiting requests, minimizing blocking time and maximizing throughput while maintaining full buffer utilization.
Solution Approach 2:
The buffer management system is dynamic rather than static. The allocate controller, deallocate controller, and dispatch controller continuously adjust the allocation and transmission of requests based on real-time buffer status. This dynamic behavior allows the system to maximize storage capacity while efficiently managing request flow to minimize blocking, as controllers can quickly respond to freed space and reallocate resources.
Data Source
AI summary
An out-of-order buffer includes an out-of-order queue and a controlling circuit. The out-of-order queue includes a request sequence table and a request storage device. The controlling circuit receives and temporarily stores the plural requests into the out-of-order queue. After the plural requests are transmitted to plural corresponding target devices, the controlling circuit retires the plural requests. The request sequence table contains m×n indicating units. The request sequence table contains m entry indicating rows. Each of the m entry indicating rows contains n indicating units. The request storage device includes m storage units corresponding to the m entry indicating rows in the request sequence table. The state of indicating whether one request is stored in the corresponding storage unit of the m storage units is recoded in the request sequence table. The storage sequence of the plural requests is recoded in the request sequence table.