Timekeeping in VMware Virtual Machines
Information Guide Copyright © 2008 VMware, Inc. All rights reserved. 1 Timekeeping in VMware Virtual Machines VMware® ESX 3.5/ESXi 3.5, VMware Workstation 6.5 Because virtual machines work by time‐sharing host physical hardware, a virtual machine cannot exactly duplicate the timing behavior of a physical machine. VMware virtual machines use several techniques to minimize and conceal differences in
Running a database on EC2? Your clock could be slowing you down.
We recently found that our database machines were spending a lot of CPU time getting the time. This post is a look at what was causing it, how you can check if your machines are affected, and how to fix it. The tl;dr is that a single command to change the Linux clocksource on our database machines cut execution times for distributed worker queries significantly. The default clocksource on many EC2
ハイパーバイザを作ってみた - Qiita
Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? 仮想マシンがどのように実現されているか気になったので、勉強がてら簡単なハイパーバイザを作ってみました。ソースコードはGitHubで公開しています。 方針 RaspberryPi3で動作するAArch64向けのType-1（ベアメタル）ハイパーバイザを作ることにしました。名前は"raspvisor"とします。 スクラッチから作り始める気力はなかったので、なるべく流用できるものは使っていくことにしました。そこで、RaspberryPiのOS開発教材であるRPi OSをハイパーバイザに改造していくことにしました。RPi OSはコード量が少なく
Updates in container isolation
May 16, 2018 This article was contributed by Antoine Beaupré KubeCon EU At KubeCon + CloudNativeCon Europe 2018, several talks explored the topic of container isolation and security. The last year saw the release of Kata Containers which, combined with the CRI-O project, provided strong isolation guarantees for containers using a hypervisor. During the conference, Google released its own hyperviso
Some notes on macvlan/macvtap « \1
There's not a lot of documentation about these interfaces. Here are some notes to summarize what I've been able to gather so far. Surely there's more to it (corrections and/or more information welcome). Macvlan interfaces can be seen as subinterfaces of a main ethernet interface. Each macvlan interface has its own MAC address (different from that of the main interface) and can be assigned IP addre
Tun/Tap interface tutorial « \1
Foreword: please note that the code available here is only for demonstration purposes. If you want to be serious, you'll have to make it more robust and integrate it with other code. Also, the description is by no means a definitive reference on the subject, but rather the result of my experimentation. Please report any bug or error you find in the code or otherwise in this article. Thanks. Link t
Multiqueue - KVM
Multiqueue virtio-net Overview This page provides information about the design of multi-queue virtio-net, an approach enables packet sending/receiving processing to scale with the number of available vcpus of guest. This page provides an overview of multiqueue virtio-net and discusses the design of various parts involved. The page also contains some basic performance test result. This work is in p
Virtual I/O Device (VIRTIO) Version 1.1
This prose specification is one component of a Work Product that also includes: Example Driver Listing: https://docs.oasis-open.org/virtio/virtio/v1.1/csprd01/listings/ This specification replaces or supersedes: Virtual I/O Device (VIRTIO) Version 1.0. Edited by Rusty Russell, Michael S. Tsirkin, Cornelia Huck, and Pawel Moll. Latest version: https://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v
What is SR-IOV? - Scott's Weblog - The weblog of an IT pro focusing on cloud computing, Kubernetes, Linux, containers, and networking
Scott's Weblog The weblog of an IT pro focusing on cloud computing, Kubernetes, Linux, containers, and networking What is SR-IOV? Published on 2 Dec 2009 · Filed in Explanation · 1131 words (estimated 6 minutes to read) I/O virtualization is a topic that has received a fair amount of attention recently, due in no small part to the attention given to Xsigo Systems after their participation in the G
Deep dive into Virtio-networking and vhost-net
In this post we will explain the vhost-net architecture described in the introduction, to make it clear how everything works together from a technical point of view. This is part of the series of blogs that introduces you to the realm of virtio-networking which brings together the world of virtualization and the world of networking. This post is intended for architects and developers who are inter
Introduction to virtio-networking and vhost-net
Virtio was developed as a standardized open interface for virtual machines (VMs) to access simplified devices such as block devices and network adaptors. Virtio-net is a virtual ethernet card and is the most complex device supported so far by virtio. In this post we will provide a high level solution overview of the virtio-networking architecture, based on establishing an interface between the hos
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Will switching Ubuntu clocksource from xen to tsc impact php/Laravel application?
https://xenbits.xen.org/docs/4.2-testing/misc/tscmode.txt
kvm interrupt emulation
Container Isolation at Scale (... and introducing gVisor)
The Definitive KVM (Kernel-based Virtual Machine) API Documentation
Blending Containers and Virtual Machines: A Study of Firecracker and gVisor
Virtualized bridged networking with MacVTap - Seravo
CPU Steal Time 入門 - Qiita
HowTo Configure SR-IOV for ConnectX-4/ConnectX-5 with KVM (Ethernet)