Sun Microsystems VIRTUALBOX VERSION 3.1.0_BETA2 - Manual (Page 51)

3 Configuring virtual machines
On AMD processors, nested paging has been available starting with the
Barcelona (K10) architecture; Intel added support for nested paging, which
they call “extended page tables” (EPT), with their Core i7 (Nehalem) processors.
Nested paging is still disabled by default even for new machines, but it can be
enabled for each virtual machine individually in the machine settings.
If your system supports nested paging (AMD-V) or EPT (VT-x), then you can
expect a significant performance increase by enabling hardware virtualization
and
the nested paging feature
• On Intel CPUs, another hardware feature called “Virtual Processor Identifiers”
(VPIDs) can greatly accelerate context switching by reducing the need for expen-
sive flushing of the processor’s Translation Lookaside Buffers (TLBs). To enable
this feature for a VM, you need to use the command line; see chapter
8.5 , VBox-
Manage modifyvm , page 114 .
3.5 Display settings
Video memory size This sets the size of the memory provided by the virtual graph-
ics card available to the guest, in MB. As with the main memory, the specified
amount will be allocated from the host’s resident memory. Based on the amount
of video memory, higher resolutions and color depths may be available.
Enable 3D acceleration If a virtual machine has Guest Additions installed, you can
select here whether the guest should support accelerated 3D graphics. Please
refer to chapter
4.9 , Hardware 3D acceleration (OpenGL and Direct3D 8/9) , page
72 for details.
Enable 2D video acceleration If a virtual machine with Microsoft Windows has
Guest Additions installed, you can select here whether the guest should sup-
port accelerated 2D video graphics. Please refer to chapter
4.10 , Hardware 2D
video acceleration for Windows guests , page 73 for details.
Remote display Under the “Remote display” tab, you can enable the VRDP server
that is built into VirtualBox to allow you to connect to the virtual machine re-
motely. For this, you can use any standard RDP viewer, such as mstsc.exe that
comes with Microsoft Windows or, on Linux systems, the standard open-source
rdesktop
program. These features are described in detail in chapter 7.4 , Re-
mote virtual machines (VRDP support) , page 99 .
3.6 Storage settings
In the VM Settings window, the “Storage” section allows you to connect virtual hard
disk, CD-ROM/DVD and floppy images and drives to your virtual machine:
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