Improving virtualization in the presence of software managed translation lookaside buffers

Xiaotao Chang, H. Franke, Y. Ge, Tao Liu, Kun Wang, J. Xenidis, Fei Chen, Yu Zhang
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引用次数: 29

Abstract

Virtualization has become an important technology that is used across many platforms, particularly servers, to increase utilization, multi-tenancy and security. Virtualization introduces additional overhead that often relates to memory management, interrupt handling and hypervisor mode switching. Among those, memory management and translation lookaside buffer (TLB) management have been shown to have a significant impact on the performance of systems. Two principal mechanisms for TLB management exist in today's systems, namely software and hardware managed TLBs. In this paper, we analyze and quantify the overhead of a pure software virtualization that is implemented over a software managed TLB. We then describe our design of hardware extensions to support virtualization in systems with software managed TLBs to remove the most dominant overheads. These extensions were implemented in the Power embedded A2 core, which is used in the PowerEN and in the Blue Gene/Q processors. They were used to implement a KVM port. We evaluate each of these hardware extensions to determine their overall contributions to performance and efficiency. Collectively these extensions demonstrate an average improvement of 232% over a pure software implementation.
在存在软件管理的翻译暂存缓冲区的情况下改进虚拟化
虚拟化已经成为跨许多平台(特别是服务器)使用的重要技术,可以提高利用率、多租户和安全性。虚拟化引入了额外的开销,通常与内存管理、中断处理和管理程序模式切换有关。其中,内存管理和翻译暂置缓冲区(TLB)管理已被证明对系统性能有重大影响。在当今的系统中存在两种主要的TLB管理机制,即软件管理的TLB和硬件管理的TLB。在本文中,我们分析并量化了在软件管理的TLB上实现的纯软件虚拟化的开销。然后,我们描述了硬件扩展的设计,以支持使用软件管理的tlb的系统中的虚拟化,从而消除最主要的开销。这些扩展是在PowerEN和Blue Gene/Q处理器中使用的Power嵌入式A2内核中实现的。它们被用来实现KVM端口。我们对每种硬件扩展进行评估,以确定它们对性能和效率的总体贡献。总的来说,这些扩展比纯软件实现平均提高了232%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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