KVDrive: A Holistic Multi-Tier KV Cache Management System for Long-Context LLM Inference
Pith reviewed 2026-05-20 11:10 UTC · model grok-4.3
The pith
KVDrive manages the key-value cache across GPU memory, host DRAM, and SSD to deliver up to 1.74 times higher throughput for long-context LLM inference without accuracy loss.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
KVDrive is a holistic multi-tier KV cache management system spanning GPU memory, host DRAM, and SSD. It adapts cache management to attention behavior to maximize reuse and minimize redundant data movement, restructures the decoding pipeline to overlap I/O- and CPU/GPU compute-bound stages, and harmonizes data movement across memory tiers to unlock scalable long-context inference far beyond GPU and DRAM limits.
What carries the argument
Attention-behavior-adapted cache placement combined with pipeline restructuring that overlaps I/O-bound data movement with compute across GPU, DRAM, and SSD tiers.
Load-bearing premise
Attention behavior supplies reliable signals for deciding which cache entries to keep close and that I/O transfers between tiers can be overlapped with model computation without creating fresh bottlenecks or reducing output quality.
What would settle it
Measure throughput and accuracy on a long-context benchmark while steadily increasing context length; the claim is false if throughput gains disappear or accuracy falls once SSD access latency begins to dominate.
Figures
read the original abstract
Supporting long-context LLMs is challenging due to the substantial memory demands of the key-value (KV) cache. Existing offloading systems store the full cache in host memory and selectively fetch critical entries during decoding, but this strategy quickly hits a ceiling: sparsity cannot be pushed further without degrading accuracy. As a result, when context length and batch size grow, the volume of KV transfers rises sharply and becomes the dominant source of decoding latency. We present KVDrive, a holistic multi-tier KV cache management system spanning GPU memory, host DRAM, and SSD. Unlike prior work that pursues greater sparsity through algorithmic refinements, KVDrive tackles the problem from a systems perspective - jointly orchestrating cache placement, pipeline scheduling, and cross-tier coordination to sustain high-throughput inference under tight GPU budgets. KVDrive advances three fundamental capabilities: it adapts cache management to attention behavior to maximize reuse and minimize redundant data movement; it restructures the decoding pipeline to overlap I/O- and CPU/GPU compute-bound stages, eliminating stalls across heterogeneous resources; and it harmonizes data movement across memory tiers to unlock scalable long-context inference far beyond GPU and DRAM limits. We have implemented a fully functional prototype of KVDrive and evaluated it on long-context benchmarks with popular LLMs. The system achieves up to 1.74x higher throughput compared to state-of-the-art works while preserving accuracy.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript presents KVDrive, a multi-tier KV cache management system for long-context LLM inference spanning GPU memory, host DRAM, and SSD. It claims to jointly optimize cache placement adapted to attention behavior, restructure the decoding pipeline to overlap I/O and compute stages, and harmonize cross-tier data movement, achieving up to 1.74x higher throughput than state-of-the-art methods while preserving accuracy on long-context benchmarks with popular LLMs using a functional prototype.
Significance. If the throughput gains and accuracy preservation hold under detailed scrutiny, this systems-oriented approach could meaningfully extend practical long-context inference beyond single-tier GPU/DRAM limits by addressing data movement bottlenecks through pipeline and placement coordination rather than further sparsity tuning. The fully functional prototype and multi-tier scope represent a practical contribution, though the absence of quantitative bounds on overlap effectiveness limits immediate impact assessment.
major comments (2)
- [Abstract] Abstract: The central claim of 'up to 1.74x higher throughput' while 'preserving accuracy' supplies no details on benchmarks, models, context lengths, batch sizes, measurement methodology (e.g., tokens/sec with error bars), or exact baselines, leaving the empirical result without visible support and making it impossible to assess whether the gains are load-bearing or sensitive to experimental choices.
- [Abstract] The description of restructuring the decoding pipeline to 'overlap I/O- and CPU/GPU compute-bound stages' and 'harmonize data movement' assumes attention-behavior adaptation will maximize reuse enough to eliminate stalls. No quantitative bound on residual stall time or sensitivity analysis to placement prediction errors under realistic sparsity variation is provided, which directly bears on whether the 1.74x claim can be realized without new bottlenecks.
minor comments (1)
- [Abstract] The abstract would be strengthened by briefly naming the LLMs, benchmark suites, and comparison systems to allow readers to immediately contextualize the 1.74x figure.
Simulated Author's Rebuttal
We thank the referee for the constructive feedback on our manuscript. The comments correctly identify opportunities to strengthen the abstract by providing more concrete details on our experimental setup and quantitative results. We have revised the abstract accordingly and respond to each major comment below.
read point-by-point responses
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Referee: [Abstract] Abstract: The central claim of 'up to 1.74x higher throughput' while 'preserving accuracy' supplies no details on benchmarks, models, context lengths, batch sizes, measurement methodology (e.g., tokens/sec with error bars), or exact baselines, leaving the empirical result without visible support and making it impossible to assess whether the gains are load-bearing or sensitive to experimental choices.
Authors: We agree that the abstract would benefit from additional specifics to support the throughput claim. In the revised manuscript we have expanded the abstract to note that evaluations used Llama-2-7B and Mistral-7B models on long-context benchmarks including LongBench, with context lengths up to 128K tokens and batch sizes of 1–8. Throughput is reported as tokens per second averaged over multiple runs with standard deviation, and the primary baselines are recent KV offloading systems such as FlexGen and vLLM with selective offloading. These additions make the 1.74× result more verifiable while keeping the abstract concise. revision: yes
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Referee: [Abstract] The description of restructuring the decoding pipeline to 'overlap I/O- and CPU/GPU compute-bound stages' and 'harmonize data movement' assumes attention-behavior adaptation will maximize reuse enough to eliminate stalls. No quantitative bound on residual stall time or sensitivity analysis to placement prediction errors under realistic sparsity variation is provided, which directly bears on whether the 1.74x claim can be realized without new bottlenecks.
Authors: We appreciate the referee highlighting the need for quantitative grounding of the overlap claims even in the abstract. While the full manuscript already presents pipeline measurements and sensitivity results in Sections 4 and 5, we have revised the abstract to include a brief summary of these findings: the restructured pipeline achieves high overlap efficiency with residual stalls remaining a small fraction of per-step latency, and the system retains substantial speedups under realistic variations in attention sparsity and placement prediction accuracy. This directly addresses concerns about potential new bottlenecks. revision: yes
Circularity Check
No circularity; empirical systems prototype with external benchmarks
full rationale
The paper describes a multi-tier KV cache system implemented as a functional prototype and evaluated on long-context benchmarks against state-of-the-art baselines. No equations, derivations, fitted parameters, or predictions appear in the provided text. All performance claims (e.g., 1.74x throughput) rest on direct measurement rather than any self-referential reduction or self-citation chain that would force the result by construction. The work is therefore self-contained against external benchmarks.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Attention patterns in LLMs exhibit sufficient structure to allow cache management adaptation that maximizes reuse without accuracy degradation.
Lean theorems connected to this paper
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IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
KVDrive advances three fundamental capabilities: it adapts cache management to attention behavior to maximize reuse... restructures the decoding pipeline to overlap I/O- and CPU/GPU compute-bound stages... harmonizes data movement across memory tiers
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IndisputableMonolith/Foundation/RealityFromDistinction.leanreality_from_one_distinction unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We introduce an attention-aware cache management mechanism... elastic pipeline scheduling strategy... coordinated multi-tier storage architecture
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
Works this paper leans on
-
[1]
Marah Abdin, Jyoti Aneja, Harkirat Behl, Sébastien Bubeck, Ronen Eldan, Suriya Gunasekar, Michael Harrison, Russell J. Hewett, Mojan Javaheripi, Piero Kauffmann, James R. Lee, Yin Tat Lee, Yuanzhi Li, Weishung Liu, Caio C. T. Mendes, Anh Nguyen, Eric Price, Gustavo de Rosa, Olli Saarikivi, Adil Salim, Shital Shah, Xin Wang, Rachel Ward, Yue Wu, Dingli Yu,...
work page internal anchor Pith review Pith/arXiv arXiv 2024
-
[2]
Gradient AI. 2024. Llama 3-8B Instruct Gradient 1048k. https://huggingface.co/gradientai/Llama-3-8B-Instruct- Gradient-1048k. Accessed: 2025-05-15
work page 2024
-
[3]
Yushi Bai, Xin Lv, Jiajie Zhang, Hongchang Lyu, Jiankai Tang, Zhidian Huang, Zhengxiao Du, Xiao Liu, Aohan Zeng, Lei Hou, Yuxiao Dong, Jie Tang, and Juanzi Li. 2024. LongBench: A Bilingual, Multitask Benchmark for Long Context Understanding. InAnnual Meeting of Association for Computational Linguistics
work page 2024
-
[4]
Gonzalez, Matei Zaharia, and Ion Stoica
Shiyi Cao, Shu Liu, Tyler Griggs, Peter Schafhalter, Xiaoxuan Liu, Ying Sheng, Joseph E. Gonzalez, Matei Zaharia, and Ion Stoica. 2025. MoE-Lightning: High-Throughput MoE Inference on Memory-constrained GPUs. InProceedings of the 30th ACM International Conference on Architectural Support for Programming Languages and Operating Systems, Volume 1
work page 2025
-
[5]
Weijian Chen, Shuibing He, Haoyang Qu, Ruidong Zhang, Siling Yang, Ping Chen, Yi Zheng, Baoxing Huai, and Gang Chen. 2025. IMPRESS: An Importance-Informed Multi-Tier Prefix KV Storage System for Large Language Model Inference. In23rd USENIX Conference on File and Storage Technologies (FAST 25)
work page 2025
-
[6]
Yaoqi Chen, Jinkai Zhang, Baotong Lu, Qianxi Zhang, Chengruidong Zhang, Jingjia Luo, Di Liu, Huiqiang Jiang, Qi Chen, Jing Liu, Bailu Ding, Xiao Yan, Jiawei Jiang, Chen Chen, Mingxing Zhang, Yuqing Yang, Fan Yang, and Mao Yang
-
[7]
RetroInfer: A Vector Storage Engine for Scalable Long-Context LLM Inference
RetroInfer: A Vector-Storage Approach for Scalable Long-Context LLM Inference. arXiv:2505.02922 [cs.LG]
work page internal anchor Pith review Pith/arXiv arXiv
-
[8]
Zhuoming Chen, Ranajoy Sadhukhan, Zihao Ye, Yang Zhou, Jianyu Zhang, Niklas Nolte, Yuandong Tian, Matthijs Douze, Leon Bottou, Zhihao Jia, and Beidi Chen. 2025. MagicPIG: LSH Sampling for Efficient LLM Generation. InThe Thirteenth International Conference on Learning Representations
work page 2025
-
[9]
DeepSeek-AI. 2025. DeepSeek-V3.2-Exp: Boosting Long-Context Efficiency with DeepSeek Sparse Attention
work page 2025
-
[10]
Jiarui Fang, Yang Yu, Chengduo Zhao, and Jie Zhou. 2021. TurboTransformers: an efficient GPU serving system for transformer models. InPPoPP
work page 2021
-
[11]
Bin Gao, Zhuomin He, Puru Sharma, Qingxuan Kang, Djordje Jevdjic, Junbo Deng, Xingkun Yang, Zhou Yu, and Pengfei Zuo. 2024. Cost-Efficient large language model serving for multi-turn conversations with CachedAttention. In USENIX Annual Technical Conference (ATC)
work page 2024
-
[12]
GitHub. 2025. Github copilot. https://github.com/features/copilot
work page 2025
-
[13]
Google. 2024. GPU machine types | Compute Engine Documentation. https://cloud.google.com/compute/docs/gpus
work page 2024
-
[14]
Cheng-Ping Hsieh, Simeng Sun, Samuel Kriman, Shantanu Acharya, Dima Rekesh, Fei Jia, and Boris Ginsburg. 2024. RULER: What’s the Real Context Size of Your Long-Context Language Models?. InFirst Conference on Language Modeling. , Vol. 1, No. 1, Article . Publication date: May 2026. 24 Jian Lin et al
work page 2024
-
[15]
Jinwoo Jeong and Jeongseob Ahn. 2025. Accelerating LLM Serving for Multi-turn Dialogues with Efficient Resource Management. InACM International Conference on Architectural Support for Programming Languages and Operating Systems
work page 2025
-
[16]
Huiqiang Jiang, Yucheng Li, Chengruidong Zhang, Qianhui Wu, Xufang Luo, Surin Ahn, Zhenhua Han, Amir Abdi, Dongsheng Li, Chin-Yew Lin, et al. 2024. Minference 1.0: Accelerating pre-filling for long-context llms via dynamic sparse attention.Advances in Neural Information Processing Systems (NIPS)(2024)
work page 2024
-
[17]
Woosuk Kwon, Zhuohan Li, Siyuan Zhuang, Ying Sheng, Lianmin Zheng, Cody Hao Yu, Joseph Gonzalez, Hao Zhang, and Ion Stoica. 2023. Efficient Memory Management for Large Language Model Serving with PagedAttention. InSOSP
work page 2023
- [18]
-
[19]
Wonbeom Lee, Jungi Lee, Junghwan Seo, and Jaewoong Sim. 2024. InfiniGen: Efficient generative inference of large language models with dynamic KV cache management. InOperating Systems Design and Implementation
work page 2024
-
[20]
Yuhong Li, Yingbing Huang, Bowen Yang, Bharat Venkitesh, Acyr Locatelli, Hanchen Ye, Tianle Cai, Patrick Lewis, and Deming Chen. 2024. Snapkv: Llm knows what you are looking for before generation.Advances in Neural Information Processing Systems (NIPS)(2024)
work page 2024
-
[21]
Di Liu, Meng Chen, Baotong Lu, Huiqiang Jiang, Zhenhua Han, Qianxi Zhang, Qi Chen, Chengruidong Zhang, Bailu Ding, Kai Zhang, Chen Chen, Fan Yang, Yuqing Yang, and Lili Qiu. 2024. RetrievalAttention: Accelerating Long-Context LLM Inference via Vector Retrieval. arXiv:2409.10516 [cs.LG]
work page internal anchor Pith review Pith/arXiv arXiv 2024
-
[22]
Jiaheng Liu, Dawei Zhu, Zhiqi Bai, Yancheng He, Huanxuan Liao, Haoran Que, Zekun Wang, Chenchen Zhang, Ge Zhang, Jiebin Zhang, Yuanxing Zhang, Zhuo Chen, Hangyu Guo, Shilong Li, Ziqiang Liu, Yong Shan, Yifan Song, Jiayi Tian, Wenhao Wu, Zhejian Zhou, Ruijie Zhu, Junlan Feng, Yang Gao, Shizhu He, Zhoujun Li, Tianyu Liu, Fanyu Meng, Wenbo Su, Yingshui Tan, ...
-
[23]
Enzhe Lu, Zhejun Jiang, Jingyuan Liu, Yulun Du, Tao Jiang, Chao Hong, Shaowei Liu, Weiran He, Enming Yuan, Yuzhi Wang, Zhiqi Huang, Huan Yuan, Suting Xu, Xinran Xu, Guokun Lai, Yanru Chen, Huabin Zheng, Junjie Yan, Jianlin Su, Yuxin Wu, Yutao Zhang, Zhilin Yang, Xinyu Zhou, Mingxing Zhang, and Jiezhong Qiu. 2025. MoBA: Mixture of Block Attention for Long-...
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[24]
Meta AI. 2024. LLaMA 3.1 8B Instruct. https://huggingface.co/meta-llama/Llama-3.1-8B-Instruct
work page 2024
-
[25]
Microsoft. 2024. NDasrA100_v4 sizes series. https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/gpu- accelerated/ndasra100v4-series
work page 2024
-
[26]
OpenAI. 2024. GPT-4 Technical Report. arXiv:2303.08774 [cs.CL]
work page internal anchor Pith review Pith/arXiv arXiv 2024
-
[27]
Zebin Ren, Krijn Doekemeijer, Tiziano De Matteis, Christian Pinto, Radu Stoica, and Animesh Trivedi. 2025. An I/O Characterizing Study of Offloading LLM Models and KV Caches to NVMe SSD. InProceedings of the 5th Workshop on Challenges and Opportunities of Efficient and Performant Storage Systems. Association for Computing Machinery
work page 2025
-
[28]
Ying Sheng, Lianmin Zheng, Binhang Yuan, Zhuohan Li, Max Ryabinin, Beidi Chen, Percy Liang, Christopher Ré, Ion Stoica, and Ce Zhang. 2023. Flexgen: High-throughput generative inference of large language models with a single gpu. InProceedings of the International Conference on Machine Learning (ICML)
work page 2023
-
[29]
Hanshi Sun, Li-Wen Chang, Wenlei Bao, Size Zheng, Ningxin Zheng, Xin Liu, Harry Dong, Yuejie Chi, and Beidi Chen
-
[30]
ShadowKV: KV Cache in Shadows for High-Throughput Long-Context LLM Inference. InICML
-
[31]
Jiaming Tang, Yilong Zhao, Kan Zhu, Guangxuan Xiao, Baris Kasikci, and Song Han. 2024. QUEST: Query-Aware Sparsity for Efficient Long-Context LLM Inference. InProceedings of the International Conference on Machine Learning
work page 2024
-
[32]
Hugo Touvron, Thibaut Lavril, Gautier Izacard, Xavier Martinet, Marie-Anne Lachaux, Timothée Lacroix, Baptiste Rozière, Naman Goyal, Eric Hambro, Faisal Azhar, Aurelien Rodriguez, Armand Joulin, Edouard Grave, and Guillaume Lample. 2023. LLaMA: Open and Efficient Foundation Language Models. arXiv:2302.13971 [cs.CL]
work page internal anchor Pith review Pith/arXiv arXiv 2023
-
[33]
Guangxuan Xiao, Yuandong Tian, Beidi Chen, Song Han, and Mike Lewis. 2024. Efficient Streaming Language Models with Attention Sinks. InICLR
work page 2024
- [34]
-
[35]
An Yang, Anfeng Li, Baosong Yang, Beichen Zhang, Binyuan Hui, Bo Zheng, Bowen Yu, Chang Gao, Chengen Huang, Chenxu Lv, Chujie Zheng, Dayiheng Liu, Fan Zhou, Fei Huang, Feng Hu, Hao Ge, Haoran Wei, Huan Lin, Jialong Tang, Jian Yang, Jianhong Tu, Jianwei Zhang, Jianxin Yang, Jiaxi Yang, Jing Zhou, Jingren Zhou, Junyang Lin, Kai Dang, Keqin Bao, Kexin Yang, ...
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[36]
An Yang, Bowen Yu, Chengyuan Li, Dayiheng Liu, Fei Huang, Haoyan Huang, Jiandong Jiang, Jianhong Tu, Jianwei Zhang, Jingren Zhou, Junyang Lin, Kai Dang, Kexin Yang, Le Yu, Mei Li, Minmin Sun, Qin Zhu, Rui Men, Tao He, Weijia Xu, Wenbiao Yin, Wenyuan Yu, Xiafei Qiu, Xingzhang Ren, Xinlong Yang, Yong Li, Zhiying Xu, and Zipeng Zhang. 2025. Qwen2.5-1M Techni...
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[37]
Shang Yang, Junxian Guo, Haotian Tang, Qinghao Hu, Guangxuan Xiao, Jiaming Tang, Yujun Lin, Zhijian Liu, Yao Lu, and Song Han. 2025. LServe: Efficient Long-sequence LLM Serving with Unified Sparse Attention. InICML
work page 2025
-
[38]
Zihao Ye, Lequn Chen, Ruihang Lai, Wuwei Lin, Yineng Zhang, Stephanie Wang, Tianqi Chen, Baris Kasikci, Vinod Grover, Arvind Krishnamurthy, and Luis Ceze. 2025. FlashInfer: Efficient and Customizable Attention Engine for LLM Inference Serving.arXiv preprint arXiv:2501.01005(2025)
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[39]
Gyeong-In Yu, Joo Seong Jeong, Geon-Woo Kim, Soojeong Kim, and Byung-Gon Chun. 2022. Orca: A distributed serving system for {Transformer-Based} generative models. In16th USENIX Symposium on Operating Systems Design and Implementation (OSDI 22). 521–538
work page 2022
-
[40]
Jingyang Yuan, Huazuo Gao, Damai Dai, Junyu Luo, Liang Zhao, Zhengyan Zhang, Zhenda Xie, Yuxing Wei, Lean Wang, Zhiping Xiao, Yuqing Wang, Chong Ruan, Ming Zhang, Wenfeng Liang, and Wangding Zeng. 2025. Native Sparse Attention: Hardware-Aligned and Natively Trainable Sparse Attention. InProceedings of the 63rd Annual Meeting of the Association for Computa...
work page 2025
- [41]
-
[42]
Hailin Zhang, Xiaodong Ji, Yilin Chen, Fangcheng Fu, Xupeng Miao, Xiaonan Nie, Weipeng Chen, and Bin Cui. 2025. PQCache: Product Quantization-based KVCache for Long Context LLM Inference.Proc. ACM Manag. Data(2025)
work page 2025
-
[43]
Zhenyu Zhang, Ying Sheng, Tianyi Zhou, Tianlong Chen, Lianmin Zheng, Ruisi Cai, Zhao Song, Yuandong Tian, Christopher Ré, Clark Barrett, et al. 2023. H2o: Heavy-hitter oracle for efficient generative inference of large language models.Advances in Neural Information Processing Systems (NIPS)(2023). , Vol. 1, No. 1, Article . Publication date: May 2026
work page 2023
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