Hardware Accelerator for DNS Cache with TTL Pre-fetch
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Solution Overview
Problem
Current DNS lookup technologies face inefficiencies in handling DNS queries, particularly in maintaining an effective cache and managing time-to-live (TTL) parameters, leading to suboptimal performance and increased latency.
Innovation Solution
A hardware accelerator for DNS caching, which includes a packet processing engine to identify and manage DNS requests, perform cache lookups, and implement pre-fetch operations based on TTL thresholds, along with security filtering and TCP offload capabilities, utilizing a customized network interface card with programmable packet processing engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional software-based DNS lookup is used, then implementation flexibility is maintained, but processing speed and response time deteriorate
Solution Approach 1:
The DNS server functionality is segmented into two parts: a hardware accelerator for high-speed cache operations and a software component for complex DNS server logic. The hardware accelerator handles packet processing, cache management, and TTL operations in parallel, while the software handles domain name resolution algorithms and protocol management, resolving the contradiction between speed and complexity
Solution Approach 2:
A hardware accelerator acts as an intermediary between the network interface and the DNS server software. It pre-processes incoming DNS packets, performs cache lookups, and filters traffic before passing relevant information to the software DNS server, enabling fast processing without requiring full software involvement in every operation
2Reliability
If cache size is increased to improve hit ratio, then memory usage increases, but cache effectiveness improves
Solution Approach 1:
The system dynamically changes cache parameters including entry size, allocation policies, and TTL values based on traffic patterns. The hardware accelerator can adjust cache parameters in real-time to optimize the balance between cache hit ratio and memory resource consumption, adapting to different workload conditions
3Productivity
If manual cache management is used, then control precision is maintained, but processing overhead and latency increase
Solution Approach 1:
The hardware accelerator implements self-service cache management by automatically performing cache lookups, TTL decrements, and entry evictions without software intervention. The system autonomously manages cache operations including pre-fetching entries based on traffic patterns, eliminating processing overhead while maintaining precise control through dedicated hardware logic
Data Source
AI summary
Techniques for a hardware accelerator for a domain name server (DNS) cache are disclosed. In some embodiments, a hardware accelerator for a DNS cache includes: executing a packet processing engine of a host device to identify a DNS request; and performing a DNS lookup in the DNS cache. In some embodiments, a hardware accelerator for a DNS cache includes: determining if a time to live (TTL) parameter associated with a first entry stored in the DNS cache is below a threshold value; and if the TTL parameter associated with the first entry stored in the DNS cache is below the threshold value, then performing a pre-fetch operation to update the first entry in the DNS cache, wherein the updated entry comprises an updated TTL value.