NDLI: SRVM: Hypervisor Support for Live Migration with Passthrough SR-IOV Network Devices

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SRVM: Hypervisor Support for Live Migration with Passthrough SR-IOV Network Devices

Leveraging Managed Runtime Systems to Build, Analyze, and Optimize Memory Graphs

SRVM: Hypervisor Support for Live Migration with Passthrough SR-IOV Network Devices

Content Provider	ACM Digital Library
Author	Davda, Bhavesh Xu, Xin
Abstract	Single-Root I/O Virtualization (SR-IOV) is a specification that allows a single PCI Express (PCIe) device (ysical function or PF) to be used as multiple PCIe devices (virtual functions or VF). In a virtualization system, each VF can be directly assigned to a virtual machine (VM) in passthrough mode to significantly improve the network performance. However, VF passthrough mode is not compatible with live migration, which is an essential capability that enables many advanced virtualization features such as high availability and resource provisioning. To solve this problem, we design SRVM which provides hypervisor support to ensure the VF device can be correctly used by the migrated VM and the applications. SRVM is implemented in the hypervisor without modification in guest operating systems or guest VM drivers. Our experimental results show that SRVM can effectively migrate all memory state, and there is no data loss or corruption in applications after live migration. SRVM does not increase VM downtime. It only costs limited resources (an extra CPU core), and there is no significant runtime overhead in VM network performance. In fact, since the VF can continue to be used during the pre-copy ase, it offers network throughput which is 9.6 times and network latency which is 98% lower compared to other solutions that switch to para-virtualization mode during live migration.
Starting Page	65
Ending Page	77
Page Count	13
File Format	PDF
ISBN	9781450339476
DOI	10.1145/2892242.2892256
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-03-25
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Passthrough Live migration Sr-iov Virtual network Virtualization
Content Type	Text
Resource Type	Article

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