Dynamic I/O Translation Table Allocation for SR-IOV Adapters
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Solution Overview
Problem
Current systems face challenges in dynamically allocating sufficient memory for I/O translation tables when transitioning Single Root Input Output Virtualization (SR-IOV) adapters from dedicated to shared mode, leading to insufficient memory for efficient resource sharing among multiple logical partitions.
Innovation Solution
The method involves determining memory requirements for I/O translation tables using a configuration file and dynamically allocating additional memory at runtime to ensure sufficient resources for SR-IOV adapters operating in shared mode, allowing for efficient memory utilization and resource sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If memory is allocated statically at boot time for SR-IOV adapters, then system initialization is simplified, but the memory is insufficient when transitioning to shared mode
Solution Approach 1:
The patent implements dynamic memory allocation for I/O translation tables by introducing a runtime allocation mechanism that adjusts memory capacity based on the operational mode. The system transitions from static boot-time allocation to dynamic runtime allocation, allowing the I/O translation table memory to expand when transitioning from dedicated to shared mode, thereby resolving the contradiction between adaptability and memory quantity.
2Adaptability or versatility
If memory is allocated for shared mode at boot time, then mode transition is enabled, but memory is underutilized during dedicated mode
Solution Approach 1:
The system dynamically adjusts memory allocation based on the operational mode. In dedicated mode, only the necessary minimum memory is allocated for the I/O translation table, preventing underutilization. When transitioning to shared mode, the system dynamically expands memory allocation to meet the increased requirements, thereby eliminating waste while maintaining adaptability.
Solution Approach 2:
The patent changes the memory allocation parameter from a fixed static value to a dynamic value that adjusts based on operational mode. The system monitors the mode state and modifies the I/O translation table memory size accordingly, optimizing resource utilization by matching memory capacity to actual operational requirements in each mode.
3Productivity
If I/O translation table size is increased for shared mode, then resource sharing efficiency improves, but system complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the system automatically manages I/O translation table memory allocation without requiring manual intervention. The memory management subsystem autonomously detects mode transitions, calculates required memory sizes, and performs allocation or expansion operations, thereby improving resource sharing efficiency while keeping the complexity hidden from users.
Data Source
AI summary
Dynamic I/O translation table allocation for SR-IOV enabled I/O adapters including receiving an instruction to transition the SR-IOV adapter to shared mode; determining, using a configuration file for the SR-IOV adapter, memory requirements for an I/O translation table; comparing the memory requirements for the I/O translation table to memory currently allocated for use by the SR-IOV adapter; based on the comparing the memory requirements for the I/O translation table to the memory currently allocated for use by the SR-IOV adapter, determining that the memory currently allocated for use by the SR-IOV adapter is insufficient to store the I/O translation table and determining an additional amount of memory required to store the I/O translation table; and allocating, at runtime, the additional amount of memory for storing the I/O translation table.