Abstract
Differentiated I/O services for applications with their own requirements are very important for user satisfaction. Nonvolatile memory express (NVMe) solid-state drive (SSD) architecture can improve the I/O bandwidth with its numerous submission queues, but the quality of service (QoS) of each I/O request is never guaranteed. In particular, if many I/O requests are pending in the submission queues due to a bursty I/O workload, urgent I/O requests can be delayed, and consequently, the QoS requirements of applications that need fast service cannot be met. This paper presents a scheme that handles urgent I/O requests without delay even if there are many pending I/O requests. Since the pending I/O requests in the submission queues cannot be controlled by the host, the host memory buffer (HMB), which is part of the DRAM of the host that can be accessed from the controller, is used to process urgent I/O requests. Instead of sending urgent I/O requests into the SSDs through legacy I/O paths, the latency is removed by directly inserting them into the HMB. Emulator experiments demonstrated that the proposed scheme could reduce the average and tail latencies by up to 99% and 86%, respectively.
Highlights
Nonvolatile memory express (NVMe) is a storage interface designed for fast nonvolatile storage media such as solid-state drives (SSDs) [1]
This paper presented an I/O scheme that provides guaranteed performance even when an SSD
This paper presented an I/O scheme that provides guaranteed performance even when an SSD is overburdened due to numerous I/O requests
Summary
Nonvolatile memory express (NVMe) is a storage interface designed for fast nonvolatile storage media such as solid-state drives (SSDs) [1]. Since the host operating systems cannot control pending I/O requests in the NVMe submission queues, the existing I/O scheduling algorithms at the block I/O layer are not very effective in this case [3,4]. We present a scheme in which urgent I/O requests are not delayed even when there are many pending I/O requests in the submission queues To this end, we exploit the host memory buffer (HMB), which is one of the extended features provided by NVMe. It allows an SSD to. It is important not to violate the protocol of the NVMe interface while providing QoS for urgent I/O requests This issue is addressed by adding another submission queue or using an administration queue, which is a queue for processing.
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