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Compared with QEMU native NVMe emulation solution, the best solution SPDK-vhost NVMe has 6X improvement in IOPS and 70% reduction in latency for some read workloads generated by FIO.
NVMe allows a host system to reduce latency because it offers a high parallel operation and optimized command processing flow.
Employing netmap, and developing a new diskmap service, which provides safe high-performance userspace direct I/O access to NVMe devices, we amortize system overheads by utilizing efficient batching of outstanding I/O requests, process-to-completion, and zerocopy operation.
Though the IOPS and latency for read and write on NVMe SSDs are greatly improved, it seems that the existing software cannot efficiently explore the abilities of those NVMe SSDs, and it is even worse on virtualized platform.
Proceedings ArticleDOI
Yongseok Son, Hara Kang, Hyuck Han, Heon Y. Yeom 
21 Sep 2015
11 Citations
While the technology is commercially viable, it is important to consider the performance of NVM devices with NVMe specification according to different I/O configurations and analyze workloads on the storage to exploit better performance.
This paper proposes new methods with Host Memory Buffer to improve IO performance in NVMe interface.
NVMe based SSDs are the latest development in this domain, delivering unprecedented performance in terms of both latency and peak bandwidth.
We provide, first of its kind study of I/O intensive containerized applications operating with NVMe SSDs.
This leads to a performance mismatch of what the device is capable of delivering and what it actually delivers, and the gains derived from high speed NVMe devices is nullified.
Given their superior performance, NVMe drives are expected to be particularly beneficial for I/O intensive applications in datacenter installations.