Memory-Mapped Hardware FIFO for Low-Latency Data Queuing
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Solution Overview
Problem
Existing microprocessor computer systems face challenges in efficiently handling high-data rate network traffic, leading to latency penalties, cache pollution, and potential data corruption or loss due to network congestion and protocol overhead.
Innovation Solution
The implementation of memory-mapped hardware FIFOs with control mechanisms, allowing for efficient data mapping, transformation, and forwarding across distributed computing architectures, thereby offloading queue management from the processor core to hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are sent to cache memory for processing, then data can be stored and processed, but latency penalties increase and cache pollution occurs
Solution Approach 1:
The patent segments the memory hierarchy by introducing a dedicated FIFO buffer structure that is separate from cache memory. The FIFO is implemented as a distinct data structure with its own head and tail pointers, allowing data to be queued without polluting the cache. This segmentation enables independent optimization of cache for frequently accessed data and FIFO for sequential data flow buffering.
Solution Approach 2:
The patent introduces a FIFO buffer as an intermediary structure between the network interface and the processor/cache system. This intermediary FIFO buffer absorbs the shock of high-rate incoming data packets, preventing them from directly overwhelming the cache memory and causing latency penalties. The FIFO acts as a buffer zone that decouples the high-speed data arrival from the slower processing rate.
2Adaptability or versatility
If FIFO buffers are implemented in software using memory structures, then flexibility is achieved, but processing speed decreases
Solution Approach 1:
The patent replaces the software-based FIFO implementation (which uses general-purpose memory structures and requires processor intervention) with a hardware-based FIFO buffer. This hardware FIFO is implemented using dedicated circuitry with automatic head and tail pointer management, eliminating the need for software intervention and significantly increasing data processing speed while maintaining the FIFO data structure flexibility.
Solution Approach 2:
The hardware FIFO buffer is designed to be self-managing with automatic head and tail pointer updates. The FIFO controller automatically handles data enqueueing at the tail and dequeueing from the head without requiring processor intervention, making the system self-service and eliminating the performance overhead of software management while preserving adaptability.
3Measurement precision
If processor cores handle network traffic directly, then protocol processing is accurate, but processor availability decreases
Solution Approach 1:
The patent extracts the network traffic buffering function from the processor core, placing it in a dedicated hardware FIFO buffer. This extraction allows the processor to focus on high-level protocol processing and application logic while the hardware FIFO handles the low-level data queuing and rate matching. The processor core retains control over protocol processing accuracy through configuration and control registers while gaining improved availability.
4Loss of time
If high data rates are handled without buffering, then latency is minimized, but data corruption or loss occurs due to congestion
Solution Approach 1:
The patent implements preliminary buffering action by introducing a hardware FIFO buffer that pre-queues incoming data packets before they are processed. This preliminary buffering prevents data loss during congestion by holding data in the FIFO until the processing pipeline is ready, while the direct memory-mapped access path maintains low latency by avoiding unnecessary data copying or complex buffering operations.
Data Source
AI summary
An apparatus for a microprocessor computer system and method for configuring the same where said microprocessor computer system comprises a processor core and at least one hardware buffer FIFO with memory-mapped head and tail that handles data movement among the processor cores, networks, raw data input and outputs, and memory. The method for configuring said microprocessor computer system comprises utilizing a FIFO auxiliary processor to process said data traversing said hardware FIFO; utilizing said hardware FIFOs to efficiently pipe data through functional blocks; and utilizing a FIFO controller to perform DMA operations that include non-unit-stride access patterns and transfers among processor cores, networks, raw data input and outputs, memory, and other memory-mapped hardware FIFOs.