NIC Dynamic Triggered Command Management Without Local Buffering
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Solution Overview
Problem
Network interface controllers (NICs) face inefficiencies in managing triggered operations due to the need for local buffering, which consumes resources and leads to unnecessary overhead when waiting for trigger conditions to be satisfied, especially in scenarios with repetitive operations.
Innovation Solution
The NIC system dynamically manages triggered operations by determining trigger conditions and locations in an external command queue, issuing commands without local buffering, and reusing trigger conditions, allowing batch-processing and efficient command management without the need for internal storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NIC uses local buffering to store triggered operations while waiting for trigger conditions, then the operations can be managed and processed, but it consumes valuable NIC resources and creates unnecessary overhead
Solution Approach 1:
The patent extracts the buffering function from the NIC by storing triggered operations in host memory instead of NIC local buffers. The NIC only retains minimal state information (trigger condition satisfaction status and command queue location), while the actual operation data resides externally in the command queue, eliminating the need for substantial local buffering resources.
Solution Approach 2:
The command queue in host memory acts as an intermediary between the NIC and the triggered operations. It stores the operations and provides a mechanism for the NIC to access and process them without requiring the NIC to maintain large local buffers, thus resolving the resource consumption issue while maintaining operational reliability.
2Productivity
If the NIC stores triggered operations locally in buffers, then it can process them when trigger conditions are met, but it leads to unnecessary overhead especially in scenarios with repetitive operations
Solution Approach 1:
The patent implements preliminary action by having the host application pre-populate the command queue with triggered operations and their associated trigger conditions before submitting to the NIC. The NIC then simply monitors for condition satisfaction and processes operations from the pre-prepared queue, eliminating the overhead of managing and storing operations locally while maintaining processing productivity.
Solution Approach 2:
The system discards the traditional approach of storing operations in NIC buffers and recovers by using the external command queue. After operations are processed, the buffer space is effectively recovered and reused for new operations, eliminating the persistent overhead associated with maintaining dedicated local buffer storage in the NIC.
3Productivity
If the NIC uses extensive local storage for triggered operations, then it can handle batch operations, but it increases device complexity and reduces scalability
Solution Approach 1:
The patent moves the storage dimension from the NIC (device-level) to the host system (system-level). By storing triggered operations in host memory rather than NIC local buffers, the solution maintains batch operation handling capability while reducing NIC device complexity and improving scalability, as the NIC no longer requires extensive onboard storage resources.
Data Source
AI summary
A system for facilitating efficient command management in a network interface controller (NIC) is provided. During operation, the system can determine, at the NIC, a trigger condition and a location in a command queue for a set of commands corresponding to the trigger condition. The command queue can be external to the NIC. The location can correspond to an end of the set of commands in the command queue. The system can then determine, at the NIC, whether the trigger condition has been satisfied. If the trigger condition is satisfied, the system can fetch a respective command of the set of commands from the command queue and issuing the command from the NIC until the location is reached, thereby bypassing locally storing the set of commands prior to the trigger condition being satisfied.