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# 2026-09
## 09-09 P0-Day01 PCIe 拓扑与 Config Space
- 读: Day01-lecture.md(拓扑/BDF/Config Space/BAR)
- 写: 无(概念日)
- 数据: BDF 上限 256×32×8 = 65536 功能;Config Space 256B;X540 ID 以 lspci 实测为准
## 09-09 算法-哈希表原理
- 读: algo-theory/01-hash-table.md + LC1 参考实现
- 写: 无(🔴 要求参考实现,09-11 重做)
- 数据: 平均 O(1) 最坏 O(n);负载因子 >0.75 扩容 rehash
## 09-09 RDMA-丢包的代价
- 读: Week 1 开篇(QP/verbs/零拷贝/RoCEv2)
- 写: 无
- 数据: 丢包 = 全局传染 + ≥1 RTT 硬件重传 + 木桶放大;PFC 暂停 = 局部可恢复