Network Queue Monitoring via ASIC Microcode Telemetry
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Solution Overview
Problem
Network devices face challenges in detecting and handling bursts of network traffic, leading to queue saturation and potential packet drops or delays, as existing technologies lack efficient real-time monitoring capabilities.
Innovation Solution
Implementing a microcode engine in a forwarding ASIC within network devices to monitor queue depth and generate telemetry packets, which are transmitted to a queue management device, enabling near real-time detection of traffic bursts and resource conservation by eliminating the need for additional processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional processors are added to monitor network queues, then monitoring capability is improved, but device complexity increases
Solution Approach 1:
The forwarding ASIC monitors its own queue depth using an integrated microcode engine, eliminating the need for separate monitoring processors. The ASIC serves itself by incorporating the monitoring function directly into its architecture, thereby improving measurement precision without increasing device complexity.
Solution Approach 2:
The patent merges the queue monitoring function with the forwarding ASIC by implementing a microcode engine within the ASIC. This integration combines packet forwarding and queue depth monitoring into a single unified component, resolving the contradiction between improved monitoring capability and increased device complexity.
2Loss of time
If real-time queue monitoring is implemented, then fault detection speed is improved, but processing overhead increases
Solution Approach 1:
The microcode engine continuously monitors queue depth in advance of potential packet processing bottlenecks. By performing preliminary monitoring actions within the forwarding plane, the system detects queue saturation conditions before they affect packet processing, enabling proactive fault detection without adding processing overhead to the packet forwarding path.
Solution Approach 2:
The microcode engine acts as an intermediary between the packet processing function and the queue monitoring function. It efficiently collects queue depth information and generates telemetry packets without interfering with the main packet forwarding process, thus achieving real-time fault detection while maintaining high packet processing efficiency.
3Measurement precision
If queue depth measurements are collected from memory, then measurement accuracy is improved, but access time increases
Solution Approach 1:
The patent extracts queue depth measurement data directly from the forwarding ASIC's memory into telemetry packets. By taking out the measurement function from the packet processing path and implementing it within the ASIC's microcode engine, the system achieves accurate measurements without the latency overhead of external monitoring access.
Data Source
AI summary
A network device may include a controller and a hardware forwarding component. The hardware forwarding component may receive a network packets and assign the network packets to multiple network queues. The network device may also obtain, using a microcode engine of the hardware forwarding component, and for each of the network queues, a measurement of queue depth, each measurement of queue depth being obtained from memory of the hardware forwarding component. Based on the measurements of queue depth, the network device may generate and transmit a telemetry packet.