Find all needed information about Virtual Apic Hardware Optimization Support. Below you can see links where you can find everything you want to know about Virtual Apic Hardware Optimization Support.
https://www.virtualbox.org/manual/ch14.html
Poor performance with 32-bit guests on certain Intel CPU models that do not include virtual APIC hardware optimization support. This affects mainly Windows and Oracle Solaris guests, but possibly also some Linux kernel revisions.
https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/slides/hw_io_virtualization.pdf
Intel APIC Virtualization (APICv) - Acknowledgement and Receipt of Interrupts at guests without Hypervisor - Virtual APIC Page - vIRR, vISR, vEOI, vICR Registers - Hardware Emulation - Support for Posted Interrupts - Exit. CPU Posted Interrupts - Interrupts that are directly injected by the Hypervisor to a Guest on a Different Core. IOMMU ...
https://software.intel.com/en-us/blogs/2013/12/17/apic-virtualization-performance-testing-and-iozone
Dec 17, 2013 · Introduction Virtual machine monitors (VMM) emulate most guest access to interrupts and the advanced programmable interrupt controller (APIC) in a virtual environment. They also virtualize all guest interrupts. These activities require the exit and reentry of the virtual machines (VM), but they are time consuming and are a major source of overhead.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/4-x/virtualization/Cisco-ACI-Virtualization-Guide-411/Cisco-ACI-Virtualization-Guide-411_chapter_010.html
Sep 13, 2019 · Cisco Application Centric Infrastructure (ACI) virtual machine (VM) networking supports hypervisors from multiple vendors. It provides the hypervisors programmable and automated access to high-performance scalable virtualized data center infrastructure.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/sect-virtualization_tuning_optimization_guide-introduction-7_improvements
Improved storage performance and scalability provided by multi-queue support in the virtio-scsi driver. This enables each virtual CPU to have a separate queue and …
http://mirror.aminidc.com/redhat/RHEL_7.2/Docs/Red_Hat_Enterprise_Linux-7-Virtualization_Tuning_and_Optimization_Guide-en-US.pdf
APIC Virtualization (APICv) Newer Intel processors offer hardware virtualization of the Advanced Programmable Interrupt Controller (APICv). APICv improves virtualized x86_64 guest performance by allowing the guest to directly access the APIC, dramatically cutting down interrupt latencies and the number of virtual machine exits caused by the APIC.
https://www.linux-kvm.org/images/7/70/2012-forum-nakajima_apicv.pdf
KVM Forum 2012 Interrupt/APIC Virtualization: Overview • VMM must virtualize guest’s interrupts and interrupt controller (APIC) − Models APIC control state on a “virtual-APIC page” in memory • VMM must emulate nearly all guest accesses to APIC control registers
https://software.intel.com/en-us/forums/virtualization-software-development/topic/284386
It is expected that a VMM will not map this physical address into the address space of any guest, except guests for which the virtual-APIC address is identical to the APIC-access address. The APIC-access address and the virtual-APIC address were made distinct from each other to support guests with multiple virtual processors.
https://serverfault.com/questions/74672/why-should-i-enable-io-apic-in-virtualbox
ACPI is the current industry standard to allow operating systems to recognize hardware, configure motherboards and other devices and manage power. As all modern PCs contain this feature and Windows and Linux have been supporting it for years, it is also enabled by default in VirtualBox.
https://www.virtualbox.org/manual/ch03.html
Use virtual hardware to communicate with the host system or with other guests. For example, you can use virtual hardware in the following ways: Have Oracle VM VirtualBox present an ISO CD-ROM image to a guest system as if it were a physical CD-ROM.
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