How we saved 100 terabytes of memory by optimizing 1.1.1.1’s DNS cache

Cloudflare cut per-entry memory 56% in 1.1.1.1's DNS cache via five Rust optimizations, freeing about 100 TB across its fleet.

Cloudflare engineers applied five Rust-level memory optimizations to the Big Pineapple DNS cache layout behind the 1.1.1.1 resolver. The changes cut per-entry memory usage by 56%, freeing approximately 100 terabytes of memory across the fleet.

• Five Rust-level optimizations reduced DNS cache per-entry memory by 56%.
• Approximately 100 TB of memory reclaimed across Cloudflare's fleet.
• Work targets the Big Pineapple cache serving 1.1.1.1.