Throttling Completion Queue Elements to Prevent Receiver Overflow
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Solution Overview
Problem
Conventional computer-networking communication standards can cause errors due to completion operations occupying and overflowing the processing power of receiving computers, especially when they are in a sleep mode, leading to inefficiencies and potential errors.
Innovation Solution
A throttling system that monitors the completion queue and instructs the sender to enter or exit a throttle mode based on the queue's high or low marks, preventing overflow by adjusting the sending of completion queue elements, thereby maintaining efficient message handling without reducing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If completion operations are sent to wake up the receiving computer, then the receiving computer can process incoming data, but the completion operations can occupy and overflow the processing power of the receiving computer
Solution Approach 1:
The patent implements a feedback mechanism where the receiving computer monitors the number of outstanding completion queue elements and compares it against threshold values (low mark and high mark). When the count exceeds the high mark, the receiver sends a throttle indication to the sender to reduce completion operations. When the count drops below the low mark, normal operation resumes. This closed-loop feedback system dynamically adjusts completion operation flow to prevent overflow while ensuring reliable message processing.
Solution Approach 2:
The patent introduces dynamic threshold-based control where the sender's completion operation behavior changes based on real-time queue conditions. The system transitions between different operational states (normal mode vs. throttle mode) based on the outstanding completion queue element count relative to dynamically monitored thresholds, allowing the system to adapt its processing behavior to current load conditions.
2Reliability
If the receiver processes all completion queue elements, then message handling is thorough, but the receiver becomes busy or overflowed with completion queue elements
Solution Approach 1:
The patent applies preliminary anti-action by proactively preventing completion queue overflow before it occurs. The receiver monitors the outstanding completion queue element count and, upon detecting that the high mark is reached, sends a throttle indication to the sender to stop or reduce completion operations. This preemptive measure prevents the receiver from becoming overloaded, avoiding the need for complex overflow handling mechanisms while maintaining complete message processing reliability.
3Productivity
If the sender continuously sends completion queue elements, then throughput is maintained, but the receiver may be overwhelmed and errors occur
Solution Approach 1:
The patent uses feedback control to dynamically adjust sender behavior based on receiver capacity. The receiver continuously monitors outstanding completion queue elements and provides feedback through throttle indications when the high mark is reached. The sender responds by entering throttle mode, reducing completion operation frequency. This feedback loop maintains optimal throughput by adapting to receiver capacity in real-time, preventing errors while maximizing message processing efficiency.
Data Source
AI summary
A computer-implemented method for message handling between a receiver and a sender of a throttling system is provided. The computer-implemented method includes receiving a first message that includes a completion queue element by the receiver from the sender. The computer-implemented method includes detecting that a number of outstanding completion queue elements in a completion queue meets or exceeds a high mark and instructing the sender to enter a throttle mode. The computer-implemented method includes receiving a second message without a completion queue element by the receiver from the sender. The computer-implemented method includes detecting that the number of the outstanding completion queue elements in the completion queue meets or is below a low mark and instructing the sender to exit the throttle mode.