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feat: SRTT-based nameserver selection #19

Merged
razvandimescu merged 4 commits from feat/srtt-nameserver-selection into main 2026-03-29 05:22:32 +08:00
Conversation 0 Commits 4 Files Changed 11 +683 -37

4 Commits

Author SHA1 Message Date
Razvan Dimescu
6ceb14a54e docs: add install/upgrade instructions, smarter benchmark priming 
README: document `numa install`, `numa service`, Homebrew upgrade,
and `make deploy` workflows. Benchmark: replace fixed `sleep 4` with
`wait_for_priming` that polls cache entry count for stability.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-28 23:21:35 +02:00
Razvan Dimescu
239938dc07 fix: apply SRTT decay before EWMA so recovered servers rehabilitate 
Without decay-before-EWMA, a server penalized at 5000ms stayed near
that value even after recovery — the stale raw penalty was used as the
EWMA base instead of the decayed estimate. Extract decayed_srtt()
helper and call it in record_rtt() before the smoothing step.

Also restores removed "why" comments in send_query / resolve_recursive.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-28 23:16:18 +02:00
Razvan Dimescu
076dd3677f feat: show DNSSEC and SRTT status in dashboard + API 
Add dnssec and srtt boolean fields to /stats API response.
Display on/off indicators in the dashboard footer.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
 2026-03-28 22:45:23 +02:00
Razvan Dimescu
5c5b7dbf58 feat: SRTT-based nameserver selection for recursive resolver 
BIND-style Smoothed RTT (EWMA) tracking per NS IP address. The resolver
learns which nameservers respond fastest and prefers them, eliminating
cascading timeouts from slow/unreachable IPv6 servers.

- New src/srtt.rs: SrttCache with record_rtt, record_failure, sort_by_rtt
- EWMA formula: new = (old * 7 + sample) / 8, 5s failure penalty, 5min decay
- TCP penalty (+100ms) lets SRTT naturally deprioritize IPv6-over-TCP
- Enabled flag embedded in SrttCache (no-op when disabled)
- Batch eviction (64 entries) for O(1) amortized writes at capacity
- Configurable via [upstream] srtt = true/false (default: true)
- Benchmark script: scripts/benchmark.sh (full, cold, warm, compare-all)
- Benchmarks show 12x avg improvement, 0% queries >1s (was 58%)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
 2026-03-28 22:40:47 +02:00