PCIE I/O Operation Chaining for Memory Access Latency Reduction
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Solution Overview
Problem
Existing input/output (I/O) communication systems experience significant latency due to the sequential nature of memory access operations, where each memory access must complete before the next can initiate, leading to increased overall latency in I/O operations.
Innovation Solution
Implementing I/O operation chaining, where multiple memory access operations are processed as a group (atomic unit) rather than individually, using a memory controller with chain execution units that queue and sequence these operations, allowing for simultaneous initiation of multiple sets without waiting for individual responses, and dynamically switching to unchained execution when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If memory access operations are processed sequentially (one at a time), then ordering requirements are satisfied, but communication time and latency increase significantly
Solution Approach 1:
Multiple individual memory access operations are merged into a single chained operation group. The memory controller combines multiple sequential access requests into one atomic unit that is processed as a batch, reducing the number of round trips between the I/O device and memory controller from multiple individual exchanges to a single collective exchange.
Solution Approach 2:
The memory controller performs preliminary actions by receiving and queueing multiple memory access operations in advance before executing them. The chain execution unit prepares the sequence of operations ahead of time, organizing them in the correct order while allowing the I/O device to initiate the next operation without waiting for individual completions.
2Productivity
If multiple memory access operations are processed as a group (chained), then communication time is reduced, but complexity of processing and atomic unit requirements increase
Solution Approach 1:
The processing system is segmented into distinct functional components: the I/O device that initiates operations, the memory controller that receives and manages operation groups, and the chain execution unit that processes the chained operations. This segmentation allows each component to specialize in its function, improving overall throughput while distributing complexity across multiple elements.
Solution Approach 2:
The memory controller acts as an intermediary between the I/O device and the chain execution unit. It receives operation groups from the I/O device, validates them, and passes them to the chain execution unit for processing. This intermediary layer manages the complexity of atomic unit requirements and coordination, shielding the I/O device from detailed processing complexity.
3Reliability
If I/O device waits for completion of each memory access before initiating the next, then strict ordering is maintained, but overall latency increases
Solution Approach 1:
The chained operation mechanism enables continuous useful action by allowing the I/O device to initiate multiple memory access operations in sequence without waiting for individual completions. The chain execution unit maintains continuous processing of the operation group, ensuring that each operation executes in the correct order while eliminating idle waiting time between operations.
Data Source
AI summary
A set of memory access operations is obtained. The set of memory access operations includes a plurality of memory access operations to be chained, in which the plurality of memory access operations are to be processed as an atomic unit. The plurality of memory access operations are executed in a particular order, and one or more results are provided.