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01-Applied Mathematics & Information Sciences
An International Journal


Volumes > Volume 9 > No. 2L


A Paravirtualized File System for Accelerating File I/O

PP: 599-607
Kihong Lee, Dongwoo Lee, Dong Hyun Kang, Young Ik Eom,
Recently, virtualization technologies have gained widespread use in various systems since several new technologies assist virtual machines (VMs) in achieving high performance. However, I/O-intensive workloads still suffer from performance degradation due to CPU mode switching and duplicated I/O stacks in both the guest and host operating systems. In this paper, we propose a framework for improving file I/O performance in a virtualized environment, which consists of a paravirtualized file system, a shared queue, and an I/O-dedicated thread. The key ideas are to handle file I/O requests without the interference of the hypervisor and to have I/O requests bypass the guest I/O stack. To verify the performance improvement of our approach, we implemented a prototype and measured the performance. Experimental results demonstrate that our framework outperforms virtio, the predominant I/O virtualization framework, by providing 1.21.6x better throughput and that it eliminates most vmexits during I/O process.

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