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The IOMMU allows the OS to encapsulate I/O devices in their own virtual memory spaces, thus restricting their DMAs to specific memory pages. The OS uses the IOMMU to protect itself against buggy drivers and malicious/errant devices. But the added protection comes at a cost, degrading the throughput of I/O-intensive workloads by up to an order of magnitude.… (More)
Operating systems can defend themselves against misbehaving I/O devices and drivers by employing intra-OS protection. With " strict " intra-OS protection, the OS uses the IOMMU to map each DMA buffer immediately before the DMA occurs and to unmap it immediately after. Strict protection is costly due to IOMMU-related hardware overheads , motivating "… (More)
A memory swapper for virtualized environments. Acknowledgements I thank my advisors, Assaf Schuster and Dan Tsafrir, for their academic supervision and inspiration. Through your guidance I learned how to separate the wheat from the chaff in academic research. Your contribution to this work is invaluable. It has been a privilege to work with you. I am… (More)
Acknowledgements I would like to thank my advisor Dan Tsafrir for his devoted guidance and help, my research team Nadav Amit and Muli Ben-Yehuda, my parents and my friends.
This study aimed at measuring the medico-economic interest of a care management programme established for asthmatic patients in the Amiens region ("Action Asthma Amieris") by using and comparing different evaluation tools. Three tools were used in parallel: 1) a questionnaire for collecting information on healthcare received was completed monthly by 305… (More)