Post-v2 audit consolidating ts=1 validation + v1 thrashing + v2 win, plus
critic-agent adversarial review of the v2 vs 4DP comparison.
Headline outcomes:
- TEAM_REPORT §1 (session pin starvation) fully fixed by v2 migration +
reset-on-success; direct-to-D 42.8% -> 91.6%.
- TEAM_REPORT §2/§3/§5 (LRU, backpressure, admission RPC) are absorbed by
ts=1 natural drain time, not mechanism-fixed -- will resurface under
ts=10/longer traces/higher concurrency.
- TEAM_REPORT §6 (ts=10 distortion) confirmed and locked as precondition;
TEAM_REPORT §8 (N=1 unreliable) rewritten to "high-pressure N>=3, normal N=1".
Three new problems exposed by adversarial review:
- TTFT p99: KVC 1.285s vs DP 0.427s (KVC 3.0x worse) -- cherry-picked out of
the V2_RESULTS_ZH.md headline table. Root cause: 8.3% non-direct path pays
3-7s mooncake reseed cost on 50-90K-token KV transfer.
- Error accounting asymmetry: DP has 67 fast-aborts (not 5) at ~0.08s each
counted in latency stats; KVC's 5 ReadTimeouts excluded entirely. Root
cause: --max-input-len 87811 (DP) vs 92098 (KVC) + metrics.py:124 filter.
- Topology mismatch: KVC 1P3D's prefill GPU is idle 91.7% of the time
(only ~373/4449 requests use seed/P path); 4DP CA has all 4 GPUs at full
utilization. Plus: no naive 1P3D control exists in the repo -- cannot
isolate KVC-layer contribution from 1P3D-topology contribution.
Re-scored headline: 5 KVC wins / 1 DP win / 3 draws -- still net positive
but not the "7/8 wins" framing the V2_RESULTS_ZH.md claims.
Recommended follow-ups (ROI order):
1. naive 1P3D ts=1 N=1 control (critic's only CRITICAL finding)
2. v2 N=2/N=3 to verify ts=1 determinism with new code paths
3. symmetric error accounting recompute + DP max-input-len = 92098 rerun
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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