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A Novel I/O Scheduler for SSD with Improved Performance and Lifetime

机译：具有改进性能和寿命的SSD的新型I / O调度程序

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This paper presents a novel block I/O scheduler specifically for SSDs. The scheduler leverages the internal rich parallelism resulting from SSD's highly parallelized architecture. It speculatively divides the entire SSD space into different subre-gions and dispatches requests into those subregions in a round- robin fashion at the Linux kernel block layer. In the meanwhile, to reduce the severe read-write interference problem associated with SSDs, the scheduler only dispatches a batch of unidirectional requests to the disk driver for each subregion's scheduling opportunity. Furthermore, to take advantage of SSD'S better sequential performance over random patterns, the scheduler sorts the pending requests while they are awaiting in the dispatching queues as those HDD-oriented schedulers do. The experimental results with a variety of workloads have demonstrated that the new I/O scheduler not only improves the user-perceived performance, but also enhances the underlying SSD's lifetime via reducing the block erase operations during the running processes.
机译：本文专门为SSD提供了一种小型块I / O调度程序。调度程序利用SSD高度并行化架构产生的内部丰富的并行性。它可以引用地将整个SSD空间分为不同的子项，并在Linux内核块层的循环时装中调度请求进入这些子区域。同时，为了减少与SSD相关联的严重读写干扰问题，调度器仅向磁盘驱动程序批量向每个子区域的调度机会派遣一批单向请求。此外，为了充分利用在随机模式SSD的序列性能越好，调度，而他们在调度队列等待那些HDD-面向调度做排序挂起的请求。具有多种工作量的实验结果表明，新的I / O调度器不仅可以提高用户感知性能，而且还通过减少运行过程中的块擦除操作来增强底层的SSD的寿命。

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