Cloudflare freed up 100TB of RAM behind its 1.1.1.1 DNS without adding a single server
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In a nutshell: Cloudflare has cut the memory used by the DNS cache behind its 1.1.1.1 resolver by more than half, freeing about 100TB of RAM across its network. The company did not replace server hardware or remove memory modules. Instead, engineers changed how cached DNS data is stored in software.
The optimization work was centered on Big Pineapple, Cloudflare's DNS caching platform behind the popular 1.1.1.1 resolver, DNS Firewall, and several other DNS services they offer. In a technical blog post, systems engineer Sebastiaan Neuteboom detailed five changes to the Rust codebase that shrank a typical cache entry from 953 bytes to 420 bytes.
The changes also made the cache faster. Cloudflare reported that insert throughput rose from 625,000 to 893,000 entries per second, while lookup latency fell from 828 nanoseconds to...
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