My XP VM (it's a long story) is hosted on Solaris 11.3 system, since building the performance of the VM has been poor. On investigation with prstat the single processor VM is taking 89% of cpu on a multi-core system, even when completely idle.
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$ VBoxManage --version
5.0.10r104061
The VM is defined as follows...
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$ VBoxManage list -l vms
Name: XP-MediaServer
Groups: /
Guest OS: Windows XP (32-bit)
UUID: 2d953964-308f-4726-9a3b-21ee0af5a1b8
Config file: /home/paul/VirtualBox VMs/XP-MediaServer/XP-MediaServer.vbox
Snapshot folder: /home/paul/VirtualBox VMs/XP-MediaServer/Snapshots
Log folder: /home/paul/VirtualBox VMs/XP-MediaServer/Logs
Hardware UUID: 2d953964-308f-4726-9a3b-21ee0af5a1b8
Memory size: 2048MB
Page Fusion: off
VRAM size: 64MB
CPU exec cap: 81%
HPET: off
Chipset: piix3
Firmware: BIOS
Number of CPUs: 1
PAE: off
Long Mode: off
CPUID Portability Level: 0
CPUID overrides: None
Boot menu mode: message and menu
Boot Device (1): HardDisk
Boot Device (2): Not Assigned
Boot Device (3): Not Assigned
Boot Device (4): Not Assigned
ACPI: on
IOAPIC: on
Time offset: 0ms
RTC: local time
Hardw. virt.ext: off
Nested Paging: off
Large Pages: on
VT-x VPID: on
VT-x unr. exec.: on
Paravirt. Provider: Default
State: running (since 2015-12-30T13:12:19.653000000)
Monitor count: 1
3D Acceleration: off
Teleporter Enabled: off
Teleporter Port: 0
Teleporter Address:
Teleporter Password:
Tracing Enabled: off
Allow Tracing to Access VM: off
Tracing Configuration:
Autostart Enabled: on
Autostart Delay: 0
Default Frontend:
Storage Controller Name (0): IDE
Storage Controller Type (0): PIIX4
Storage Controller Instance Number (0): 0
Storage Controller Max Port Count (0): 2
Storage Controller Port Count (0): 2
Storage Controller Bootable (0): on
IDE (0, 0): /data/virtualbox/XP-MediaServer.vdi (UUID: 4f95a78c-0962-443e-b748-5e60b0e79f0d)
IDE (1, 0): /opt/VirtualBox/VBoxGuestAdditions.iso (UUID: 2475c412-621f-48cf-a602-0f4630380643)
NIC 1: MAC: 0800278D29E1, Attachment: Bridged Interface 'net0 - Ethernet', Cable connected: on, Trace: off (file: none), Type: virtio, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 2: disabled
NIC 3: disabled
NIC 4: disabled
NIC 5: disabled
NIC 6: disabled
NIC 7: disabled
NIC 8: disabled
Pointing Device: PS/2 Mouse
Keyboard Device: PS/2 Keyboard
UART 1: disabled
UART 2: disabled
LPT 1: disabled
LPT 2: disabled
Audio: enabled (Driver: SolAudio, Controller: AC97, Codec: STAC9700)
Clipboard Mode: disabled
Drag and drop Mode: disabled
Session name: GUI/Qt
VRDE: enabled (Address 0.0.0.0, Ports 5859, MultiConn: off, ReuseSingleConn: off, Authentication type: null)
Video redirection: disabled
VRDE property: TCP/Ports = "5859"
VRDE property: TCP/Address = <not set>
VRDE property: VideoChannel/Enabled = <not set>
VRDE property: VideoChannel/Quality = <not set>
VRDE property: VideoChannel/DownscaleProtection = <not set>
VRDE property: Client/DisableDisplay = <not set>
VRDE property: Client/DisableInput = <not set>
VRDE property: Client/DisableAudio = <not set>
VRDE property: Client/DisableUSB = <not set>
VRDE property: Client/DisableClipboard = <not set>
VRDE property: Client/DisableUpstreamAudio = <not set>
VRDE property: Client/DisableRDPDR = <not set>
VRDE property: H3DRedirect/Enabled = <not set>
VRDE property: Security/Method = <not set>
VRDE property: Security/ServerCertificate = <not set>
VRDE property: Security/ServerPrivateKey = <not set>
VRDE property: Security/CACertificate = <not set>
VRDE property: Audio/RateCorrectionMode = <not set>
VRDE property: Audio/LogPath = <not set>
USB: enabled
EHCI: enabled
XHCI: disabled
USB Device Filters:
Index: 0
Active: yes
Name: TSSTcorp USB Mass Storage Device [0606]
VendorId: 13fd
ProductId: 2040
Revision: 0606
Manufacturer: TSSTcorp
Product: USB Mass Storage Device
Remote: 0
Serial Number: SATAHH00000000c66f4
Bandwidth groups: <none>
Shared folders:
Name: 'data', Host path: '/data' (machine mapping), writable
Video capturing: not active
Capture screens: 0
Capture file: /home/paul/VirtualBox VMs/XP-MediaServer/XP-MediaServer.webm
Capture dimensions: 1024x768
Capture rate: 512 kbps
Capture FPS: 25
Guest:
Configured memory balloon size: 0 MB