Selected short capacity 512: short hit rate 75.6%, throughput 217.6k pretoks/s (Zipf ||(s||)=1.1, 100,000 ops, long-key fraction 5%).

Router	Ops	Hit rate
Short table (≤15 B stand-in)	95,103	75.6%
Long map	4,897	77.1%

Packed-value sketch for a hot pretok (rank 1): {'n': 2, 'ids': (31153, 14201), 'bytes': 16} — production packs this into val: u64 + ext: u64 inside a 32-byte entry so a hit is one cache line, not an arena chase. Production detail this model omits: hugepages for dTLB, L2 prefetch during pretok fill, L1 prefetch ~16 probes ahead, and pair-wise linear probe (two 32 B entries sharing a 64 B line).