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fix: scale FEC ratio with loss rate in benchmarks

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The bench tool now auto-calculates the FEC ratio needed to survive
the requested loss percentage, matching how the adaptive quality
controller would behave in production.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-03-27 14:21:21 +04:00
parent 3c99503eb1
commit 85f472d824
1 changed files with 7 additions and 2 deletions
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9
crates/wzp-client/src/bench.rs
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@@ -136,8 +136,13 @@ pub fn bench_fec_recovery(loss_pct: f32) -> FecResult {
let profile = QualityProfile::GOOD; // 5 frames/block, 0.2 ratio
let frames_per_block = profile.frames_per_block as usize;
let num_blocks = 100;
// Use a higher FEC ratio for the bench so recovery is possible at higher loss
let fec_ratio = if loss_pct > 20.0 { 1.0 } else { 0.5 };
// Scale FEC ratio to survive the requested loss rate.
// At X% loss, we keep (1-X/100) of packets. We need at least
// frames_per_block packets to recover, so total packets needed =
// frames_per_block / (1 - loss/100). Ratio = (total - source) / source.
let keep_fraction = 1.0 - (loss_pct / 100.0).min(0.95);
let total_needed = (frames_per_block as f32 / keep_fraction).ceil();
let fec_ratio = ((total_needed / frames_per_block as f32) - 1.0).max(0.2);
let start = Instant::now();