{
  "experiment": "migration_trigger_validation",
  "date": "2026-05-30",
  "hardware": "dash2, 8xH20, Qwen3-Coder-30B-A3B, TP=1",
  "substrate": "kv_both + DR-fix (delay_free_blocks + VLLM_EVICT_SENT_BLOCKS gate)",
  "arms": {
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        "total": 807,
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        "ttft_p50": 0.719,
        "ttft_p90": 11.499,
        "ttft_p99": 45.982,
        "tpot_p90": 0.0239,
        "e2e_p50": 2.265,
        "e2e_p90": 24.507,
        "e2e_p99": 71.233
      },
      "migrations": 0
    },
    "unified_v4_1x": {
      "metrics": {
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        "total": 807,
        "ttft_mean": 4.142,
        "ttft_p50": 0.711,
        "ttft_p90": 12.293,
        "ttft_p99": 46.148,
        "tpot_p90": 0.0217,
        "e2e_p50": 2.293,
        "e2e_p90": 23.955,
        "e2e_p99": 75.915
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      "trigger_summary": {
        "trace": "w600_r0.0015_st30_first600s.jsonl",
        "qps_factor": 1,
        "total_requests": 807,
        "migrations_triggered": 13,
        "size_floor_filtered": 552,
        "eligible_requests": 255,
        "slo_arm_true": 100,
        "src_pp_nonzero": 22
      }
    },
    "unified_v4_2x": {
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        "total": 807,
        "ttft_mean": 5.227,
        "ttft_p50": 0.942,
        "ttft_p90": 15.0,
        "ttft_p99": 59.227,
        "tpot_p90": 0.1087,
        "e2e_p50": 5.035,
        "e2e_p90": 39.401,
        "e2e_p99": 163.032
      },
      "trigger_summary": {
        "trace": "trace_2x.jsonl (timestamps / 2)",
        "qps_factor": 2,
        "total_requests": 807,
        "migrations_triggered": 4,
        "size_floor_filtered": 550,
        "eligible_requests": 257,
        "slo_arm_true": 133,
        "src_pp_nonzero": 62,
        "pending_prefill_p90_when_nonzero": 68131,
        "migrated_details": [
          {
            "session_id": "1313181",
            "input_length": 22686,
            "new_local": 22686,
            "src_pending_prefill": 13360,
            "fleet_median_pp": 6680.0,
            "proj_prefill_s": 5.15,
            "target_idx": 5
          },
          {
            "session_id": "1310590",
            "input_length": 32440,
            "new_local": 14520,
            "src_pending_prefill": 57051,
            "fleet_median_pp": 12630.5,
            "proj_prefill_s": 10.22,
            "target_idx": 4
          },
          {
            "session_id": "1373431",
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            "new_local": 126340,
            "src_pending_prefill": 73385,
            "fleet_median_pp": 33294.5,
            "proj_prefill_s": 28.53,
            "target_idx": 4
          },
          {
            "session_id": "1313181",
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            "src_pending_prefill": 19503,
            "fleet_median_pp": 3806.5,
            "proj_prefill_s": 5.29,
            "target_idx": 5
          }
        ]
      }
    }
  }
}