Features/Virtx2apic
From FedoraProject
< Features(Difference between revisions)
(accepted by FESCo on 2010-02-02) |
(Bump to 100, indicate virt-* should enable this automatically) |
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== Current status == | == Current status == | ||
* Targeted release: [[Releases/13 | Fedora 13]] | * Targeted release: [[Releases/13 | Fedora 13]] | ||
| − | * Last updated: 2010- | + | * Last updated: 2010-04-06 |
| − | * Percentage of completion: | + | * Percentage of completion: 100% |
== Detailed Description == | == Detailed Description == | ||
| Line 24: | Line 24: | ||
== How To Test == | == How To Test == | ||
| − | * Run a Fedora 13 guest on a Fedora 13 host, with x2apic enabled. | + | * Run a Fedora 13 guest on a Fedora 13 host, with x2apic enabled. Installs via virt-install and virt-manager should enable this automatically. |
* Verify that x2apic is present in /proc/cpuinfo. | * Verify that x2apic is present in /proc/cpuinfo. | ||
* Verify dmesg contains "Enabling x2apic". | * Verify dmesg contains "Enabling x2apic". | ||
Latest revision as of 22:14, 6 April 2010
Contents |
[edit] Virt x2apic
[edit] Summary
x2apic is an x86 feature that improves performance, especially on large systems. Virt x2apic is a port of this feature for KVM, improving guest performance, especially for guests with many virtual processors.
[edit] Owner
- Name: Avi Kivity
- Email: <avi@redhat.com>
[edit] Current status
- Targeted release: Fedora 13
- Last updated: 2010-04-06
- Percentage of completion: 100%
[edit] Detailed Description
x2apic improves guest performance by reducing the overhead of APIC access, which is used to program timers and for issuing inter-processor interrupts. By exposing x2apic to guests, and by enabling the guest to utilize x2apic, we improve guest performance.
[edit] Benefit to Fedora
Fedora users will see improved guest performance and lower cpu utilization.
[edit] Scope
- x2apic support is already present in the guest and host.
- libvirt/virt-manager = ?
[edit] How To Test
- Run a Fedora 13 guest on a Fedora 13 host, with x2apic enabled. Installs via virt-install and virt-manager should enable this automatically.
- Verify that x2apic is present in /proc/cpuinfo.
- Verify dmesg contains "Enabling x2apic".
- For a bonus, measure the overhead of an IPI with and without x2apic.
[edit] User Experience
User experience is unchanged except for improved performance.
[edit] Dependencies
- kernel
- qemu-kvm
- libvirt
- virt-manager
[edit] Contingency Plan
- Since this is a transparent feature, no contingency plan is necessary.
[edit] Documentation
- FIXME: link to upstream docs?
[edit] Release Notes
- Fedora 13 virtualization supports x2apic in both the host and guest roles.
