Network Adapter TaaS Circuitry for Reduced Host Translation Overhead
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Solution Overview
Problem
Existing network adapters require continuous emulation of address translation structures and logic, leading to inefficiencies and increased host processing overheads, particularly in virtualized environments and RDMA transactions.
Innovation Solution
A network adapter with integrated Translation-as-a-Service (TaaS) circuitry that independently performs address translations, including VA-to-VA, VA-to-PA, and VA-to-MA conversions, relieving the host of the need to maintain parallel translation structures and logic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the host maintains parallel translation structures and logic for address translation, then address translation can be performed, but host processing overhead increases and performance decreases
Solution Approach 1:
The patent extracts the address translation function from the host system and relocates it to the network adapter. The network adapter maintains its own translation structures (translation cache and translation tables) and performs address translation independently, removing the burden of maintaining parallel translation structures from the host and eliminating the associated processing overhead.
Solution Approach 2:
The network adapter acts as an intermediary between the host memory and remote memory, performing address translation locally. It translates virtual addresses to physical addresses using its own translation structures, and only interacts with the host for cache management operations (invalidate, update, allocate), thereby reducing host involvement in the translation process.
2Productivity
If the network adapter performs address translation independently, then host processing overhead is reduced, but the network adapter complexity increases
Solution Approach 1:
The network adapter's address translation system is segmented into distinct functional components: a translation cache for storing recent translations, translation tables for maintaining address mappings, and TaaS circuitry for performing the actual translation operations. This segmentation allows each component to be optimized independently and managed efficiently.
Solution Approach 2:
The network adapter pre-allocates translation cache entries and maintains translation tables in advance, so that when address translation is needed, the operation can be performed immediately using pre-prepared structures. The adapter proactively manages the translation cache by pre-loading entries and maintaining them ready for use.
3Adaptability or versatility
If address translation is decoupled from memory access operations, then translation flexibility improves, but the system complexity increases
Solution Approach 1:
The network adapter implements a universal address translation service that can handle multiple types of address translations (virtual to physical, virtual to virtual, one-to-many mappings) through a single integrated TaaS circuitry and translation cache. This universal translator can service different protocols and memory access patterns without requiring separate translation mechanisms for each case.
Solution Approach 2:
The system implements feedback mechanisms where the network adapter monitors translation cache performance and host memory access patterns, and adjusts its translation strategies accordingly. The host can invalidate, update, or allocate translation cache entries based on observed performance, creating a feedback loop that optimizes translation efficiency while maintaining flexibility.
Data Source
AI summary
A network adapter including a host interface, a network interface, packet processing circuitry, and Translation-as-a-Service (TaaS) circuitry. The host interface is to communicate with a host over a peripheral bus. The network interface is to send and receive packets to and from a network for the host. The packet processing circuitry is to process the packets. The TaaS circuitry is integrated in the network adapter and is to (i) receive from a requesting device a request to translate an input address into a requested address in a requested address space, (ii) translate the input address into the one or more requested addresses, and (iii) return the one or more requested addresses to the requesting device.