Sun Microsystems 3.0.0 用户手册
3 Starting out with VirtualBox
Enable ACPI
VirtualBox can present the Advanced Configuration and Power Interface
(ACPI) to the guest operating system for configuring the virtual hardware. In
addition, via ACPI, VirtualBox can present the host’s power status information to
the guest.
addition, via ACPI, VirtualBox can present the host’s power status information to
the guest.
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.
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.
Warning: All Windows operating systems starting with Windows 2000 install
different kernels depending on whether ACPI is available, so ACPI must not
be turned off
different kernels depending on whether ACPI is available, so ACPI must not
be turned off
after installation of a Windows guest OS. Turning it on after
installation will have no effect however.
Enable I/O APIC
Advanced Programmable Interrupt Controllers (APICs) are a newer
x86 hardware feature that have replaced old-style Programmable Interrupt Con-
trollers (PICs) in recent years. With an I/O APIC, operating systems can use more
than 16 interrupt requests (IRQs) and therefore avoid IRQ sharing for improved
reliability.
trollers (PICs) in recent years. With an I/O APIC, operating systems can use more
than 16 interrupt requests (IRQs) and therefore avoid IRQ sharing for improved
reliability.
Note: Enabling the I/O APIC is required for 64-bit guest operating systems,
especially Windows Vista; it is also required if you want to use more than one
virtual CPU in a virtual machine.
especially Windows Vista; it is also required if you want to use more than one
virtual CPU in a virtual machine.
However, software support for I/O APICs has been unreliable with some operat-
ing systems other than Windows. Also, the use of an I/O APIC slightly increases
the overhead of virtualization and therefore slows down the guest OS a little.
ing systems other than Windows. Also, the use of an I/O APIC slightly increases
the overhead of virtualization and therefore slows down the guest OS a little.
Warning: All Windows operating systems starting with Windows 2000 install
different kernels depending on whether an I/O APIC is available. As with
ACPI, the I/O APIC therefore must not be turned off after installation of a
Windows guest OS. Turning it on after installation will have no effect however.
different kernels depending on whether an I/O APIC is available. As with
ACPI, the I/O APIC therefore must not be turned off after installation of a
Windows guest OS. Turning it on after installation will have no effect however.
3.7.2.2 “Processor” tab
On the “Processor” tab, you can set how many virtual CPU cores the guest operating
systems should see. Starting with version 3.0, VirtualBox supports symmetrical multi-
processing (SMP) and can present up to 32 virtual CPU cores to each virtual machine.
systems should see. Starting with version 3.0, VirtualBox supports symmetrical multi-
processing (SMP) and can present up to 32 virtual CPU cores to each virtual machine.
You should not, however, configure virtual machines to use more CPU cores than
you have available physically.
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