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What is it? PV on HVM is a mixture of paravirtualization and full hardware virtualization. The primary goal of PV on HVM is to boost performance of fully virtualized HVM guests through use of specially optimized paravirtual device drivers (also called PVHVM or PV-on-HVM drivers). The table shows how PV, HVM and PV on HVM compare in terms of virtualization method: Performance PV-on-HVM drivers are
This page contains answers to some common problems and questions about Xen. This list contains the most frequently asked questions. You may also want to check out the articles in Category:FAQ. Each section in this document links to further questions in other FAQ documents. General I'd like to contribute to the Xen Project wiki pages, I have something to add/edit/fix, how can I do it? Contributions
Introduction This page evaluates the performance of the Xen VCPU schedulers with different parameters/patches and under different guest loads. The motivation was the observation that a configuration where dom0 vcpus were pinned to a set of pcpus in the host using dom0_vcpus_pin and the guests were prevented from running on the dom0 pcpus (here called "exclusively-pinned dom0 vcpus", or xpin) cause
The information in this page is out-dated. It doesn't reflect the latest performance of Xen network drivers. Please have a look at https://events.linuxfoundation.org/sites/events/files/slides/zoltan_kiss_xensummit2014_network_perf.pdf for latest information. Overview This page discusses the performance of an implementation of multiple transmit and receive queues (multiple shared rings) for xen-net
Tuning your Xen installation: recommended settings Storage options There are several choices for storage, however it is important to understand that the IO performance inside of the guest depends greatly on the storage option used: LVM: this is probably the simplest way for obtaining good storage IO performance on Linux without much hassle. ZFS ZVOLS: this is a more advanced configuration, and sho
Mini-OS is a tiny OS kernel distributed with the Xen Project Hypervisor sources. It is mainly used as operating system for stub domains that are used for Dom0 Disaggregation. But it is also used as a basis for development of Unikernels, having been instrumental in the formation of multiple examples including ClickOS and Rump kernels. As of March 2015 mini-os now has its own git tree. Previously (r
Xen Project PVHVM drivers for Linux HVM guests This page lists some resources about using optimized paravirtualized PVHVM drivers (also called PV-on-HVM drivers) with Xen Project fully virtualized HVM guests running (unmodified) Linux kernels. Xen Project PVHVM drivers completely bypass the Qemu emulation and provide much faster disk and network IO performance. Note that Xen Project PV (paravirtua
What is the Xen Project Hypervisor? The Xen Project hypervisor is an open-source type-1 or baremetal hypervisor, which makes it possible to run many instances of an operating system or indeed different operating systems in parallel on a single machine (or host). The Xen Project hypervisor is the only type-1 hypervisor that is available as open source. It is used as the basis for a number of differ
Introduction Setting up an efficient network in the world of virtual machines can be a daunting task. Hopefully, this guide will be of some help, and allow you to make good use of your network resources. The guide applies to XCP 1.0 and later, and to XenServer 5.6 FP1 and later. Much of it is applicable to earlier versions, too. For a general guide on XenServer network configurations, see Designin
To Do: This page is outdated. In particular the hardware sections need to be updated. Please also check XenPCIpassthrough wiki page for more general information about Xen PCI passthru usage! VT-d Pass-Through is a technique to give a domU exclusive access to a PCI function using the IOMMU provided by VT-d. It is primarily targeted at HVM (fully virtualised) guests because PV (paravirtualized) pass
What is paravirt_ops? paravirt_ops (pv-ops for short) is a piece of Linux kernel infrastructure to allow it to run paravirtualized on a hypervisor. It currently supports VMWare's VMI, Rusty's lguest, and most interestingly, Xen. The infrastructure allows you to compile a single kernel binary which will either boot native on bare hardware (or in hvm mode under Xen), or boot fully paravirtualized in
Best Practices for Xen Project This wiki page lists various best practices for running Xen Project hypervisor. Information here applies to opensource Xen Project software from XenProject.org, not necessarily to XenServer or XCP. Paravirtualization (PV) or (hardware-assisted virtualization) HVM Paravirtualization used to be the recommended choice, because it required no hardware support and less em
We only recently started collecting this information and rely on you to let us know how it works for you! List of tested graphics adapters for Xen VGA Passthrough Please send an email to xen-devel or xen-users with all the details about your VGA graphics passthru experience. If you are confident that your adaptor works, feel free to just add it to this page. Please include the following details in
Needs Refactor Mixes Glossary, FAQ & HowTo elements Hyperthreading FAQ What is hyperthreading? Hyper-threading is the Intel technology name, and commonly known name, for the Computing concept known as simultaneous multithreading. AMD have an equivalent technology known as Cluster Multi-threading. Hyperthreading is a technology designed to improve the computational performance of superscalar proces
The Xen Project wiki is a support and documentation resource for the Xen Project community. It is editable by community members and we need your contributions to make it better. The Xen Project Wiki has been subject to sustained severe spam attacks in the last few years. To solve this and keep the wiki usable for everyone, we had to lock down the wiki and create an editors group. CAPTCHAs do not a
Introduction The purpose of this document is to guide users through the process of installing Xen Project software from source (either from the tarball releases or from a source code repository). This document was written targeting the Xen Project 4.2 release, but an attempt will be made to point out differences from previous releases where relevant. An assumption is made of some familiarity with
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