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Thursday, October 24 • 12:00pm - 12:30pm
On Paravirualizing TCP: Congestion Control on Xen VMs - Luwei Cheng, Student, University of Hong Kong

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While datacenters are increasingly adopting VMs to provide elastic cloud services, they still rely on traditional TCP for congestion control. In this talk, I will first show that VM scheduling delays can heavily contaminate RTTs sensed by VM senders, preventing TCP from correctly learning the physical network condition. Focusing on the incast problem, which is commonly seen in large-scale distributed data processing such as MapReduce and web search, I find that the solutions that have been developed for *physical* clusters fall short in a Xen *virtual* cluster. Second, I will provide a concrete understanding of the problem, and reveal that the situations that when the sending VM is preempted versus when the receiving VM is preempted, are different. Third, I will introduce my recent attempts on paravirtualizing TCP to overcome the negative effect caused by VM scheduling delays.


Luwei Cheng

PhD student, Department of Computer Science, The University of Hong Kong
I am a 2nd-year PhD student, in Department of Computer Science, the University of Hong Kong. My research interest is mainly about virtualization technologies for cloud computing, including but not limited to VM scheduling, I/O models, and guest OS design. I have been using/researching... Read More →

Thursday October 24, 2013 12:00pm - 12:30pm BST
Moorfoot Hall Edinburgh International Conference Centre

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