Distributed Translation Agents for Virtualized I/O Address Mapping
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Solution Overview
Problem
Centralized DMA address translation in virtualized information handling systems leads to increased DMA access times and memory transaction overhead, poor scalability, and a single point of failure due to reliance on main memory-resident translation tables.
Innovation Solution
Distributing translation agents to the I/O subsystem, including I/O hubs and devices, to perform DMA address translations, reducing reliance on main memory and enabling efficient device-to-device access, with a discovery module to configure and manage these agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If centralized translation agent architecture is used, then address translation coordination is simplified, but DMA access time increases and memory transaction overhead increases
Solution Approach 1:
The patent divides the centralized translation agent into multiple distributed translation agents located at different I/O hubs and devices. Each translation agent independently handles address translation for its local devices, eliminating the single centralized bottleneck and reducing DMA access time by avoiding centralized coordination overhead.
2Device complexity
If main memory-resident translation tables are used, then translation information is centralized and easy to manage, but memory transaction overhead increases
Solution Approach 1:
The patent extracts translation information from main memory and places it in local translation buffers at each distributed translation agent. This extraction eliminates repeated main memory accesses for translation lookups, significantly reducing memory transaction overhead while maintaining translation management capability.
3Device complexity
If centralized translation agent control is used, then translation coordination is simplified, but scalability deteriorates
Solution Approach 1:
The patent segments the centralized translation control into multiple independent distributed translation agents. Each agent autonomously manages translation for its local I/O devices, allowing the system to scale by simply adding more distributed agents without increasing centralized control complexity.
4Device complexity
If centralized translation agent architecture is used, then translation management is centralized, but single point of failure risk increases
Solution Approach 1:
The patent divides the single centralized translation agent into multiple distributed translation agents. This segmentation eliminates the single point of failure, as each distributed agent independently handles translation for its local devices, ensuring system reliability even if individual agents fail.
Data Source
AI summary
Virtualization of I/O devices to support operation of plural virtual machines on a host information handling system is managed with distributed translation agents that translate addresses generated from I/O devices according to mapping defined by a virtual machine monitor. The translation agents reside in the host I/O subsystem, such as at I/O hubs or at I/O devices. A discovery module discovers and configures plural translation agents to coordinate I/O device communications with translation of physical memory addresses and virtual I/O addresses.