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perf(download): 阶段0 下载提速——BBR、并发兼容与多线程下载引导
实测:单连接 143KB/s(172MB 需约 20 分钟),3 并发 551KB/s(3.8x 线性提升),
瓶颈为 ECS 出网带宽(约 4.4Mbps)叠加跨运营商单流 TCP 吞吐劣化;
limit_rate 2m 从未被触及,故不做提高(无收益)。
- deploy.sh 幂等启用 BBR + fq(容器共享宿主内核),改善单流吞吐;
内核不支持或无 root 时告警跳过,不中断部署
- nginx 增 tcp_nopush(配合 sendfile 减少小包);单 IP 并发 4→8 以兼容
多线程下载器(限 4 会使超出连接被拒 503),并加全站下载总并发上限 24
防止连接耗尽
- 下载页新增提速引导:说明支持断点续传/分段下载、展示可复制直链、
保留 GitHub 备用源入口
注:此为缓解措施,带宽天花板仍在 ECS,根治需迁移 OSS+CDN(阶段1)。1 parent 889e609 commit f7aa5c3
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