【作者】 李宇骞； 袁欣颢； 王磊； 刘超； 刘洋； 顾荣辉； 王乃铮； 陈渝；

【Author】 Yuqian Li, Yang Liu, Ronghui Gu, Yu Chen Department of Computer Science and Technology, Tsinghua University, Beijing 100088, China

【机构】 清华大学计算机科学技术系；

【摘要】 通过扩展基于单机的硬件设备/驱动框架,提供外设层上的远程设备共享和访问服务,(即分布式设备的共享访问模式)可在系统层面上给用户提供各种分布式IO服务,从而共享分布式设备。然而,基于单机的硬件传输协议并没有考虑到网络远程连接可能带来的数据传输的不确定性,导致分布式共享设备的IO服务质量无法得到保证。本文对分布式共享设备的等时传输进行了优化,利用网络传输的高带宽和一个初始的时间偏移来补偿网络带来的不稳定性(相对于USB连接)。实验证明,该优化技术能让原本在无线及有线网络环境下无法稳定地进行分布式运行的USB音箱和USB摄像头稳定运行。同时,该系统在获得的稳定性提升和付出的初始时间偏移代价之间是灵活可调的,其稳定性增加速度相对于时间偏移量的增加呈稳定增长的趋势。更多还原

【Abstract】 Remote peripheral accessing by extending the device/driver framework on a single computer through network could provide users many different kinds of distributed IO services on OS level. It’s a good way to share distributed devices. However, the transfer protocol designed for single computer doesn’t consider the instability of networks. As a result, the quality of service is unguaranteed. This paper proposes a system based on UUAL[1] distributed devices sharing system to improve the quality of isochronous transfer by utilizing high bandwidth of network and an initial delay. It has been proved by the experiment that this technology will enable devices such as USB speakers and webcams to work smoothly under wireless LAN and wired LAN which caused instable performance of the same devices. Meanwhile, the system is flexible with the stability gained and the initial delay paid. The acceleration of stability increased is increasing steady as the initial delay increases.更多还原