CSR/PDOS: Concurrent, Direct Network Access: High-performance, Low-overhead Network I/O Virtualization

CSR/PDOS：并发、直接网络访问：高性能、低开销网络 I/O 虚拟化

• 批准号: 0720878
• 负责人: Alan Cox
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0720878&HistoricalAwards=false
• 关键词: CSR; PDOS; Concurrent; Direct; Network

The economics of supporting a growing number of Internet-based applications has created a demand for server consolidation, and thus a resurgence of interest in virtualization. Virtualization systems for commodity hardware virtualize processor, memory, and I/O devices in software. Although this enables these systems to support a wide range of hardware, it also leads to significant overheads.We have developed Concurrent, Direct Network Access (CDNA), a new I/O virtualization architecture combining software and hardware that reduces the overhead of network virtualization. This architecture provides untrusted virtual machines safe, direct access to the network interface. While CDNA dramatically improves the efficiency of I/O virtualization, a notable gap between native and virtualized I/O performance still exists.This project's objective is to eliminate this performance gap without sacrificing the generality and manageability of software-based I/O virtualization. This leads to three main thrusts. First, we are working to mitigate the remaining overheads of the CDNA I/O virtualization architecture, which include memory protection and the scheduling of interrupts. Second, we are developing mechanisms to support full virtualization, memory protection using IOMMU hardware, and protected DMA by a conventional NIC. This will improve the generality of the CDNA I/O virtualization architecture. Finally, we are developing mechanisms to enable migration among systems with and without CDNA and to provide mechanisms for network resource provisioning. This will facilitate system managament for virtualized servers using the CDNA I/O virtualization architecture. Altogether, this research will make CDNA a complete I/O virtualization solution that provides efficient, general, and manageable I/O virtualization.

支持越来越多的基于Internet的应用程序的经济性产生了对服务器整合的需求，因此对虚拟化的兴趣重新抬头。 用于商用硬件的虚拟化系统在软件中虚拟化处理器、存储器和I/O设备。 虽然这使这些系统能够支持广泛的硬件，但它也导致了显着的开销。我们开发了并发，直接网络访问（CDNA），这是一种新的I/O虚拟化架构，结合了软件和硬件，减少了网络虚拟化的开销。 此体系结构为不受信任的虚拟机提供了对网络接口的安全、直接访问。 虽然CDNA极大地提高了I/O虚拟化的效率，但本机和虚拟化I/O性能之间仍然存在显著的差距。本项目的目标是在不牺牲基于软件的I/O虚拟化的通用性和可扩展性的情况下消除这种性能差距。 这导致了三个主要的推力。 首先，我们正在努力减轻CDNA I/O虚拟化架构的剩余管理费用，其中包括内存保护和中断调度。 其次，我们正在开发支持完全虚拟化的机制，使用IOMMU硬件进行内存保护，并通过传统的NIC进行DMA保护。 这将提高CDNA I/O虚拟化架构的通用性。 最后，我们正在开发的机制，使系统之间的迁移与不CDNA，并提供网络资源配置的机制。 这将有助于使用CDNA I/O虚拟化架构对虚拟化服务器进行系统管理。 总之，这项研究将使cDNA一个完整的I/O虚拟化解决方案，提供高效，通用和可管理的I/O虚拟化。