]> 2026-09-08T16:35:32+09:00 Lesson:d2fq device direct fair queueing for nvme ssds 36293af6 3000 ko WRR을 실제 구현한 NVMe SSD를 공유하는 multi-tenant Linux I/O. NVMe WRR의 priority queues를 서로 다른 service-rate queue로 추상화하고, flow virtual time과 global minimum에 따라 submit 시 즉시 queue를 선택한다. H/L ratio를 동적으로 조정한다. S3ResearchAgent high Publication scope: international. Lab publication metadata: 1. Jiwon Woo, Minwoo Ahn, Gyusun Lee, and Jinkyu Jeong "D2FQ: Device-Direct Fair Queueing for NVMe SSDs," in Proceedings of 19th USENIX Conference on File and Storage Technologies (FAST'21), Virtual event, Feb 23–25, 2021. slides, video Verification level: full_text. Sources checked: https://www.usenix.org/conference/fast21/presentation/woo https://www.usenix.org/system/files/fast21-woo.pdf 2026-07-16T15:04:07Z 2461238.1278588 Publication record 1: Jiwon Woo, Minwoo Ahn, Gyusun Lee, and Jinkyu Jeong "D2FQ: Device-Direct Fair Queueing for NVMe SSDs," in Proceedings of 19th USENIX Conference on File and Storage Technologies (FAST'21), Virtual event, Feb 23–25, 2021. slides, video Short-term unfairness의 이론적 상한은 없고 실험적으로만 확인했다. NVMe WRR 지원 장치가 필요하며 주 평가는 Samsung Z-SSD에 의존한다. 장치 queue 수 제약도 있다. D2FQ: Device-Direct Fair Queueing for NVMe SSDs MQFQ 대비 CPU utilization을 최대 45% 줄이면서 공정성을 유지했다. LL-D2FQ는 latency를 최대 35% 낮추고 bandwidth를 최대 54% 높였다. YCSB+FIO에서는 bandwidth ratio 1.00-1.05를 보였다. NVMe SSD를 여러 flow가 공유할 때 block-layer의 submit-arbitrate-dispatch 비용 없이 weight 비례 공정성을 제공할 수 있는가? lab 장치의 scheduling primitive를 host weighted virtual time과 결합하면 host staging/arbitration을 없애면서 공정성을 근사할 수 있다. Draft 2026-07-18T14:58:25Z 2461240.1239005 2026-07-18T14:58:25Z 2461240.1239005 d2fq device direct fair queueing for nvme ssds 36293af6 3000 ev_bb2177a84d554b2f 2026-07-16T15:04:08Z 2461238.1278704 S3ResearchAgent Jiwon Woo, Minwoo Ahn, Gyusun Lee, and Jinkyu Jeong "D2FQ: Device-Direct Fair Queueing for NVMe SSDs," in Proceedings of 19th USENIX Conference on File and Storage Technologies (FAST'21), Virtual event, Feb 23–25, 2021. slides, video paper Source: Yonsei University Computer Systems Laboratory publication list supplied by the user. Manifestation 1 of 1. not_recorded d2fq device direct fair queueing for nvme ssds 36293af6# 81d3d02d82d87e9207f34477627d8a05 3000 canonical-paper-v2-36293af6 2026-07-18T05:17:55Z 2461239.7207755 S3ResearchAgent Jiwon Woo, Minwoo Ahn, Gyusun Lee, and Jinkyu Jeong "D2FQ: Device-Direct Fair Queueing for NVMe SSDs" in Proceedings of 19th USENIX Conference on File and Storage Technologies (FAST'21), Virtual event, Feb 23–25, 2021. paper 정본 Lesson 보강 근거. 검토 원본: Lesson:technical_review_d2fq_device_direct_fair_queueing_for_nvme_ssds_c60d73e1. 확인 범위: full_text. 확인한 자료: https://www.usenix.org/conference/fast21/presentation/woo ; https://www.usenix.org/system/files/fast21-woo.pdf. 질문, 방법, 평가, 해석, 재사용 교훈, 적용 범위와 한계를 같은 Lesson 본문에 통합했습니다. full_text d2fq device direct fair queueing for nvme ssds 36293af6# ac263652aedad713c331a1b6ed1ebd39 3000 2026-07-18T14:58:25Z 2461240.1239005 S3ResearchAgent verify_d78ed8ec6a23e8c740d0 partial_source context 보존 원문 객체를 확보했으나 이 일괄 검증에서는 claim-bearing 범위를 재판정하지 않아 결론을 보류함. inconclusive 9ea9d6be14bf4d24361ed45a604d4488f55b0f4a5fc4e656a4afcd5d95749877 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=9ea9d6be14bf4d24361ed45a604d4488f55b0f4a5fc4e656a4afcd5d95749877 보존 파일 objects/sha256/9e/9ea9d6be14bf4d24361ed45a604d4488f55b0f4a5fc4e656a4afcd5d95749877 ev_bb2177a84d554b2f 052ddab408243726aebafd1fa699ca4e3dbfec08dfb0f5c3244f59c0d34da4ef d2fq device direct fair queueing for nvme ssds 36293af6# 0db7b11891355a0a8318f6a091981ff8 3000 2026-07-18T14:58:25Z 2461240.1239005 S3ResearchAgent verify_99bff20e892c141d8d4c full_text observation,interpretation,reusable_lesson observation=supported; interpretation=supported; reusable_lesson=supported supports 9ea9d6be14bf4d24361ed45a604d4488f55b0f4a5fc4e656a4afcd5d95749877 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=9ea9d6be14bf4d24361ed45a604d4488f55b0f4a5fc4e656a4afcd5d95749877; independently adjudicated claim-bearing primary source PDF pp. 8–12, §4 Evaluation, Figures 11–16; design §3. canonical-paper-v2-36293af6 dff31556f4a4efc111744230737a43f7b5fa2ce044b31a19ce51c79fd17f1716 d2fq device direct fair queueing for nvme ssds 36293af6# 6622d9470524b8e3de5e0a2e23a7b041 Lesson:technical review d2fq device direct fair queueing for nvme ssds c60d73e1 3000 ko technical review d2fq device direct fair queueing for nvme ssds c60d73e1 Supersedes 102 ko Supersedes