Abstract:
Because current virtualized devices in the system simulation process and I / O instructions execute serially, which can not play performance advantages of accelerated I / O access technical such as Direct Memory Access(DMA), asynchronous I / O in the real architecture,there is a certain gap between virtual platform I / O performance and the real I / O performance. To solve this problem,this paper presents a stand-alone I / O virtualization method,which separates the I / O simulation activities such as disk access from the Virtual Machine Monitor(VMM) only retained the appropriate interfaces by putting the activities in a stand-alone process to achieve I / O simulation and parallel instruction execution, and based on QEMU platform implements the method. Experimental results show that the I / O performance is better than the original QEMU I / O subsystem by this method. Because I / O instructions do not have to wait for I / O simulation ends, this method not only improves the speed of the CPU instruction execution,but also can effectively improve disk read
speed by 4． 9% and increase software Viewpref VGA benchmark score by 9． 2% .
Key words:
I / O virtualization,
device simulation,
Virtual Machine Monitor(VMM),
asynchronous I / O,
Direct Memory
Access(DMA)
摘要： 当前虚拟化系统中的设备仿真过程与I / O 指令串行执行,无法发挥真实体系结构中直接存储器访问、异步I / O 等加速I / O 访问技术的性能优势,致使虚拟平台I / O 性能与真实I / O 性能存在一定差距。针对该问题,提出一种独立式I / O 虚拟化方法,通过将I / O 仿真活动(如磁盘读写)分离成一个独立的进程,虚拟机监控器(VMM)只保留相应的接口,达到将VMM 与I / O 设备分离实现仿真与指令并行化执行的目的,并基于QEMU 平台实现该方法。实验结果表明,采用该方法后的QEMU I / O 读写性能优于原有I / O 子系统。由于I / O 指令不必再等待I / O 仿真的结束,因此在提高CPU 指令执行速度的同时,能够有效提高4． 9% 的磁盘读取速度及9． 2% 的VGA 测试基准软件
Viewpref 得分。
关键词:
I / O 虚拟化,
设备仿真,
虚拟机监控器,
异步I / O,
直接存储器访问
CLC Number: