Network Device Frame Aggregation for I/O Interrupt Reduction
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Solution Overview
Problem
Existing network devices face inefficiencies in processing input/output (I/O) requests due to the large number of interrupts generated by multiple frames for large I/O operations, which slows down overall I/O processing.
Innovation Solution
Implementing a frame aggregation method where eligible frames for large I/O operations are aggregated into a single data unit with an appended header and trailer, reducing the number of interrupts by processing fewer frames at the transport layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple frames are processed individually for large I/O operations, then each frame can be processed with full protocol handling, but the number of interrupts increases significantly reducing processing efficiency
Solution Approach 1:
The patent merges multiple individual frame processing operations into a single aggregated data unit processing operation. By combining multiple frames into one aggregation data unit with a single header and trailer, the system processes multiple frames through one interrupt handler instead of generating separate interrupts for each frame, thus maintaining protocol completeness while improving throughput
Solution Approach 2:
The patent introduces an intermediary aggregation layer between the physical frame reception and the transport layer processing. This aggregation module acts as a mediator that collects multiple frames, validates them, and presents them as a single aggregated unit to the transport layer, reducing interrupt frequency while ensuring protocol compliance
2Productivity
If frame aggregation is implemented to reduce interrupts, then processing efficiency improves, but the complexity of frame eligibility checking and aggregation management increases
Solution Approach 1:
The patent segments the frame processing logic into distinct components: frame eligibility checking, aggregation decision logic, aggregation data unit construction, and transport layer interface. This segmentation allows each component to be independently optimized and managed, reducing overall system complexity while maintaining high processing efficiency
Solution Approach 2:
The patent performs preliminary actions by pre-defining aggregation eligibility criteria and pre-allocating aggregation buffers before actual frame processing begins. This preparation work simplifies the main processing loop by eliminating the need for complex runtime decisions about aggregation vs. individual processing
Data Source
AI summary
Method and system for aggregating frames at a network device coupled to computing system is provided. The network device includes an aggregator module that is configured to determine that a frame received by the device meets a first level eligibility criterion for aggregation, where the frame meets the first level eligibility criterion when the frame is a data frame for the I/O exchange identified as a large I/O operation; and a frame header meets an eligibility criterion. When the frame does not meet the first level eligibility criterion and an active aggregation exists for the exchange, then a previous aggregation data unit with an appended header and the received frame are sent to a transport layer for further processing. When the frame meets the first level eligibility criterion, the aggregator module checks a data structure maintained by the network device to determine that an aggregation flow exists for the exchange.