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● TRACKER Updated 15d ago · 7 sources tracked

Cloudflare freed up 100TB of RAM behind its 1.1.1.1 DNS without adding a single server

Cloudflare reclaimed 100TB of memory across its fleet by redesigning the DNS cache for its 1.1.1.1 service. The company achieved this reduction without adding new servers by shrinking individual cache entries and implementing five specific optimizations. These changes halved the memory usage of the DNS cache. Because the system handles 250 billion cached DNS entries simultaneously, removing a single wasted byte from each entry results in a total saving of 250GB of RAM.

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  • ✓ Cloudflare freed up 100TB of RAM behind its 1.1.1.1 DNS without adding any new servers.
  • ✓ The company redesigned and optimized the 1.1.1.1 DNS cache to reclaim memory across its fleet.
  • ✓ Five optimizations halved the memory usage of the DNS cache.
  • ✓ The system maintains 250 billion cached DNS entries at any given time.
🛡️ Source Corroboration: 7 independent reporting domains (100% confidence) ⏱ Read time: ~2 min

What changed

Cloudflare detailed a cache redesign that halved memory usage through five specific optimizations.

Live updates

  1. Cloudflare recovers 100TB of RAM through 1.1.1.1 DNS cache optimization

    Cloudflare reclaimed 100TB of memory across its fleet by redesigning the DNS cache for its 1.1.1.1 service. The company achieved this reduction without adding new servers by shrinking individual cache entries and implementing five specific optimizations. These changes halved the memory usage of the DNS cache. Because the system handles 250 billion cached DNS entries simultaneously, removing a single wasted byte from each entry results in a total saving of 250GB of RAM.

    Why it matters

    DNS caches store IP address mappings to speed up internet requests. At the scale of 1.1.1.1, minor inefficiencies in how data is stored per entry create massive hardware overhead. Reducing this footprint allows for better resource allocation without increasing physical infrastructure costs.

    What is confirmed

    • Cloudflare freed up 100TB of RAM behind its 1.1.1.1 DNS without adding any new servers.
    • The company redesigned and optimized the 1.1.1.1 DNS cache to reclaim memory across its fleet.
    • Five optimizations halved the memory usage of the DNS cache.
    • The system maintains 250 billion cached DNS entries at any given time.
    • One wasted byte per entry across the cache costs 250GB of memory.

    What to watch next

    • Technical documentation on the five specific optimizations used to halve memory usage
    • Performance metrics showing if the cache shrinkage impacted DNS resolution speed
    Sources used for this update (7)
    1. TechSpot — Cloudflare freed up 100TB of RAM behind its 1.1.1.1 DNS without adding a single server
    2. Cloudflare Blog — How we saved 100 terabytes of memory by optimizing 1.1.1.1’s DNS cache
    3. Yahoo Tech — Cloudflare frees up 100TB of RAM by shrinking 1.1.1.1's DNS cache entries — 250 billion cached DNS entries at any given time means one wasted byte costs 250GB
    4. XenoSpectrum — Cloudflare Redesigns DNS Cache Behind 1.1.1.1, Freeing Up 100TB of Memory Across Its Fleet
    5. igor´sLAB — Cloudflare saves 100 TB of RAM at 1.1.1.1 – five optimizations halve DNS cache memory usage
    6. finance.biggo.com — Cloudflare Reclaims 100TB of RAM by Overhauling 1.1.1.1 DNS Cache Design
    7. GIGAZINE — Cloudflare is saving 100TB of memory by trimming the 1.1.1.1 DNS cache by tens of bytes at a time.
    confidence 100%
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