TY - GEN
T1 - A step to support real-time in virtual machine
AU - Yoo, Seehwan
AU - Park, Miri
AU - Yoo, Chuck
PY - 2009
Y1 - 2009
N2 - Real-time is one of the unique requirements in embedded systems. In this paper, we perform a feasibility study on how to support real-time in an embedded virtual machine system. Firstly, we argue that the I/O model of the current virtual machine monitor like Xen is not suitable to support real-time applications because it lacks in predictability and it does not guarantee a deterministic I/O processing. We provide an alternative I/O model for virtualized embedded systems. Devices are categorized into four groups: dedicated, active, running, dynamic. Dedicated devices make a virtual machine simple because they do not need to be virtualized for isolation. However, dedication does not mean the performance isolation. Our experimental results with dedicated device show that traditional dedication cannot guarantee the timely responsiveness in heavy interrupt cases. Specifically, responsiveness of real-time OS degrades as interrupt load increases. Therefore, a proper interrupt control mechanism is required at virtual machine monitor level in order to support timely responsiveness. In addition, our result supports that 1) short and prioritized interrupt processing helps responsiveness in a virtual machine system; 2) smaller time quantum results in better responsiveness also.
AB - Real-time is one of the unique requirements in embedded systems. In this paper, we perform a feasibility study on how to support real-time in an embedded virtual machine system. Firstly, we argue that the I/O model of the current virtual machine monitor like Xen is not suitable to support real-time applications because it lacks in predictability and it does not guarantee a deterministic I/O processing. We provide an alternative I/O model for virtualized embedded systems. Devices are categorized into four groups: dedicated, active, running, dynamic. Dedicated devices make a virtual machine simple because they do not need to be virtualized for isolation. However, dedication does not mean the performance isolation. Our experimental results with dedicated device show that traditional dedication cannot guarantee the timely responsiveness in heavy interrupt cases. Specifically, responsiveness of real-time OS degrades as interrupt load increases. Therefore, a proper interrupt control mechanism is required at virtual machine monitor level in order to support timely responsiveness. In addition, our result supports that 1) short and prioritized interrupt processing helps responsiveness in a virtual machine system; 2) smaller time quantum results in better responsiveness also.
UR - http://www.scopus.com/inward/record.url?scp=63749132586&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=63749132586&partnerID=8YFLogxK
U2 - 10.1109/CCNC.2009.4784876
DO - 10.1109/CCNC.2009.4784876
M3 - Conference contribution
AN - SCOPUS:63749132586
SN - 9781424423095
T3 - 2009 6th IEEE Consumer Communications and Networking Conference, CCNC 2009
BT - 2009 6th IEEE Consumer Communications and Networking Conference, CCNC 2009
T2 - 2009 6th IEEE Consumer Communications and Networking Conference, CCNC 2009
Y2 - 10 January 2009 through 13 January 2009
ER -