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Scheduling I/O in Virtual Machine Monitors
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Created on: Jul 3, 2008 12:19 PM by
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Last Modified: Dec 17, 2009 6:02 PM by
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<!-- [DocumentBodyStart:bdafa1fc-d6e4-4977-acc7-9da41cf6aea3] --><div class='jive-rendered-content'><p>This paper explores the relationship between domain scheduling in a virtual machine monitor (VMM) and I/O performance. Traditionally, VMM schedulers have focused on fairly sharing the processor resources among domains while leaving the scheduling of I/O resources as a secondary concern. However, this can result in poor and/or unpredictable application performance, making virtualization less desirable for applications that require efficient and consistent I/O behavior.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This paper is the first to study the impact of the VMMscheduler on performance using multiple guest domains concurrently running different types of applications. In particular, different combinations of processor-intensive, bandwidth-intensive, and latencysensitive applications are run concurrently to quantify the impacts of different scheduler configurations on processor and I/O performance. These applications are evaluated on 11 different scheduler configurations within the Xen VMM. These configurations include a variety of scheduler extensions aimed at improving I/O performance. This cross product of scheduler configurations and application types offers insight into the key problems in VMM scheduling</p><p>for I/O and motivates future innovation in this area.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><i></p><p>Authors: Diego Ongaro, Alan L. Cox, and Scott Rixner</p><p>Date: March 2008</p><p></i></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a class="jive-link-external-small" href="http://vee08.cs.tcd.ie/slides/p30-talk.ppt">Please note there are slides to accompany this paper</a><span>|||||</span><a class="jive-link-external-small" href="http://www.cs.rice.edu/CS/Architecture/docs/ongaro-vee08.pdf" target="_blank">http://www.cs.rice.edu/CS/Architecture/docs/ongaro-vee08.pdf</a></p></div><!-- [DocumentBodyEnd:bdafa1fc-d6e4-4977-acc7-9da41cf6aea3] -->
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