翻译自:Virtualization and Performance: Understanding VM Exits 出于对特定指令 或 特定事件(eg.  page fault)的响应而导致的VM Exit(虚拟机退出)是造成虚拟化系统性能下降的主要原因.但是你有没有想过,为什么会这样?无论出于什么原因,VM Exit的背后究竟发生了什么? VM Exit意味着从当前运行的VM 到 VMM之间存在一个转换点,而VMM出于特定原因必须执行系统控制.通常,处理器必须保存VM退出时运行状态的快照.对…
Stephen Toub Download the Code Sample Asynchronous programming has long been the realm of only the most skilled and masochistic of developers-those with the time, inclination and mental capacity to reason about callback after callback of non-linear c…
In previous posts on vm.swappiness and using RAM disks we talked about how the memory on a Linux guest is used for the OS itself (the kernel, buffers, etc.), applications, and also for file cache. File caching is an important performance improvement,…
BACKGROUND OF THE INVENTION A conventional virtual-machine monitor (VMM) typically runs on a computer and presents to other software the abstraction of one or more virtual machines. Each virtual machine may function as a self-contained platform, runn…
BACKGROUND Generally, the concept of virtualization in information processing systems allows multiple instances of one or more operating systems (each, an "OS") to run on a single information processing system, even though each OS is designed to…
In one embodiment, a method includes transitioning control to a virtual machine (VM) from a virtual machine monitor (VMM), determining that a VMM timer indicator is set to an enabling value, and identifying a VMM timer value configured by the VMM. Th…
https://lonesysadmin.net/2013/12/22/better-linux-disk-caching-performance-vm-dirty_ratio/ Better Linux Disk Caching & Performance with vm.dirty_ratio & vm.dirty_background_ratio Bob Plankers December 22, 2013 Best Practices, Cloud, System Administ…
学习任何一门框架,都不可能一股脑儿的从入口代码从上到下,把代码看完, 这样其实是很枯燥的,我想也很少有人这么干,或者这么干着干着可能干不下去了. 因为肯定很无聊. 我们先从一个最最简单的小例子,来查看new Vue(options)实例,这个过程发生了什么. vm实例上的属性又如何添加上去的,又如何渲染到浏览器页面上的. 关于vue的数据依赖和虚拟dom都是重点,必然会在以后的帖子记录. 这篇帖子就根据下例子,看看实例化一个vm实例做了啥吧. 先把小例子贴出来: <div id="app&…
http://msdn.microsoft.com/en-us/library/windows/hardware/jj248719.aspx This guide describes important tuning parameters and settings that you can adjust to improve the performance and energy efficiency of the Windows Server 2012 operating system. It…
BACKGROUND INFORMATION An embodiment of the present invention relates generally to virtualization platforms and, more specifically, to a system and method to run components of a virtual machine monitor at a reduced privilege level. Various mechanisms…