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IEEE/ICACT20260323 Slide.04        [Big Slide]	Oral Presentation
	Hop-local recovery cannot work without buffering, because the upstream node must retransmit previously sent packets upon receiving NACKs. This implies a sliding-window cache of recent packets at the upstream node. The challenge is that DDR provides capacity but is inefficient for fine-grained random access. Naive per-flow buffers or linked structures introduce pointer chasing and scattered DDR reads, resulting in poor row-buffer locality and high read amplification. We therefore need a DDR-friendly cache organization.

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