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2026-10-20, Week 43
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Virual Oral Question and Answer
IEEE/ICACT20260323 Question.4
Questioner: hejf@dsp.ac.cn    2026-02-10 오후 4:59:33 		IEEE/ICACT20260323 Answer.4
Answer by Auhor wangsy@dsp.ac.cn   2026-02-10 오후 4:59:33
How does HPPC leverage DDR optimization to improve packet cache throughput and latency on WAN nodes? HPPC “DDR-optimizes” the cache by turning random accesses into sequential burst traffic: Unified DDR ring buffer for payloads: one global write pointer streams packets sequentially, avoiding per-flow allocation, fragmentation, and scattered DRAM writes. Compact two-level index on a separate DDR channel: maps (flow, seq) to ring locations in O(1) with bounded metadata accesses, reducing contention with payload DDR.

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