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feat: SRTT-based nameserver selection (#19)

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* 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>

* 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>

* 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>

* 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>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit was merged in pull request #19.
This commit is contained in:
Razvan Dimescu
2026-03-28 23:22:31 +02:00
committed by GitHub
parent 7056766a84
commit b615a56586
11 changed files with 683 additions and 37 deletions
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6
site/dashboard.html
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@@ -879,6 +879,10 @@ async function refresh() {
document.getElementById('footerUpstream').textContent = stats.upstream || '';
document.getElementById('footerConfig').textContent = stats.config_path || '';
document.getElementById('footerData').textContent = stats.data_dir || '';
document.getElementById('footerDnssec').textContent = stats.dnssec ? 'on' : 'off';
document.getElementById('footerDnssec').style.color = stats.dnssec ? 'var(--emerald)' : 'var(--text-dim)';
document.getElementById('footerSrtt').textContent = stats.srtt ? 'on' : 'off';
document.getElementById('footerSrtt').style.color = stats.srtt ? 'var(--emerald)' : 'var(--text-dim)';
// LAN status indicator
const lanEl = document.getElementById('lanToggle');
@@ -1229,6 +1233,8 @@ setInterval(refresh, 2000);
Config: <span id="footerConfig" style="user-select:all;color:var(--emerald);"></span>
· Data: <span id="footerData" style="user-select:all;color:var(--emerald);"></span>
· Upstream: <span id="footerUpstream" style="user-select:all;color:var(--emerald);"></span>
· DNSSEC: <span id="footerDnssec" style="color:var(--text-dim);">—</span>
· SRTT: <span id="footerSrtt" style="color:var(--text-dim);">—</span>
· Logs: <span style="user-select:all;color:var(--emerald);">macOS: /usr/local/var/log/numa.log · Linux: journalctl -u numa -f</span>
· <a href="https://github.com/razvandimescu/numa" target="_blank" rel="noopener" style="color:var(--amber);text-decoration:none;">GitHub</a>
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