GoVirtual: High Performance VMM-Bypass I/O in Virtual Machines

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High Performance VMM-Bypass I/O in Virtual Machines (3,149 Views)

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Created on: Jul 2, 2008 12:21 PM by admin - Last Modified: Dec 17, 2009 4:37 PM by Amitabh

<div class='jive-rendered-content'>Currently, I/O device virtualization models in virtual machine (VM) environments require involvement of a virtual machine monitor (VMM) and/or a privileged VM for each I/O operation, which may turn out to be a performance bottleneck for systems with high I/O demands, especially those equipped with modern high speed interconnects such as InfiniBand. In this paper, we propose a new device virtualization model called VMM-bypass I/O, which extends the ideaof OS-bypass originated from user-level communication. Essentially, VMM-bypass allows time-critical I/O operations to be carried out directly in guest VMs without involvement of the VMMand/or a privilegedVM. By exploiting the intelligence found in modern high speed network interfaces, VMM-bypass can significantly improve I/O and communication performance for VMs without sacrificing safety or isolation. To demonstrate the idea of VMM-bypass, we have developed a prototype called Xen-IB, which offers Infini-Band virtualization support in the Xen 3.0 VM environment. Xen-IB runs with current InfiniBand hardware and does not require modifications to existing user-level applications or kernel-level drivers that use InfiniBand. Our performance measurements show that Xen-IB is able to achieve nearly the same raw performance as the original InfiniBand driver running in a non-virtualized environment. Authors: Jiuxing Liu, Wei Huang, Bulent Abali, and Dhabaleswar K. PandaDate: 2006 <a class="jive-link-external-small" href="http://www.cc.gatech.edu/classes/AY2007/cs8803hpc_fall/lectures/16_VMMbypassIB.ppt">Please note there are slides to accompany this paper</a>|||||<a class="jive-link-external-small" href="http://nowlab.cse.ohio-state.edu/publications/conf-papers/2006/usenix06.pdf" target="_blank">http://nowlab.cse.ohio-state.edu/publications/conf-papers/2006/usenix06.pdf</a></div>

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High Performance VMM-Bypass I/O in Virtual Machines (3,149 Views)

Created on: Jul 2, 2008 12:21 PM by admin - Last Modified: Dec 17, 2009 4:37 PM by Amitabh

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