V8 ran the third_party qwen35-swebench-50sess trace (4449 reqs,
5.44h original timeline, p50 inter-turn 2.53s) at TIME_SCALE=2 with
the SnapshotStore refactor, PREFILL_MEM_FRAC=0.7, DECODE_MEM_FRAC=0.8,
16 GB snapshot_buf.
Headline result on this realistic workload:
TTFT p99 = 167 ms (vs E1's 207s on burst trace)
Latency p99 = 7.4s
100% success rate
96.4% direct-to-D fast path
The earlier TTFT 100+s numbers on E1/E4-v3 were a burst-trace
queueing artifact (all 1285 reqs arrived at t=0). On real-time
arrivals KVC stays in normal sub-second TTFT territory.
D→P snapshot link infrastructure works end-to-end (16 GB
snapshot_buf alloc'd, RPCs reach handlers, structural log
captures everything). But 0 OK events because sessions get
evicted from D before agentic's reseed path calls dump. Three
fix paths identified in §5.
f09562123b