AMD-V checkbox checked, but shows Disabled under Details tab

[jsalvo]

Code: Select all

[jsalvo@localhost jsalvo]# rpm -qa | grep Virtual
VirtualBox-1.6.4_33808_fedora9-1.x86_64
[jsalvo@localhost jsalvo]# uname -r
2.6.25.11-97.fc9.x86_64

Under Settings ( Ctrl+S ) on a machine, under General -> Advanced tab, I have the checkbox for "Enable VT-x/AMD-V" checked, since I have an AMD Turion62 X2 host CPU on my laptop.

However, the "Details" tab for the same machine shows that "VT-x/AMD-V" is Disabled.

Which one is VirtualBox really using ??

[jsalvo]

Code: Select all

[jsalvo@localhost jsalvo]# rpm -qa | grep Virtual
VirtualBox-1.6.4_33808_fedora9-1.x86_64
[jsalvo@localhost jsalvo]# uname -r
2.6.25.11-97.fc9.x86_64

Under Settings ( Ctrl+S ) on a machine, under General -> Advanced tab, I have the checkbox for "Enable VT-x/AMD-V" checked, since I have an AMD Turion62 X2 host CPU on my laptop.

However, the "Details" tab for the same machine shows that "VT-x/AMD-V" is Disabled.

Which one is VirtualBox really using ??

Well it looks like it is using the info from the "Details" tab, in that AMD-V is disabled based on the Runtime Attributes:

Code: Select all

Runtime Attributes

Screen Resolution
800x600x32

VT-x/AMD-V
Disabled

Guest Additions
Not Detected

Guest OS Type
openSUSE

How do I get it enabled ?

[jsalvo]

Code: Select all

[jsalvo@localhost jsalvo]# rpm -qa | grep Virtual
VirtualBox-1.6.4_33808_fedora9-1.x86_64
[jsalvo@localhost jsalvo]# uname -r
2.6.25.11-97.fc9.x86_64

Under Settings ( Ctrl+S ) on a machine, under General -> Advanced tab, I have the checkbox for "Enable VT-x/AMD-V" checked, since I have an AMD Turion62 X2 host CPU on my laptop.

However, the "Details" tab for the same machine shows that "VT-x/AMD-V" is Disabled.

Which one is VirtualBox really using ??

Well it looks like it is using the info from the "Details" tab, in that AMD-V is disabled based on the Runtime Attributes:

Code: Select all

Runtime Attributes

Screen Resolution
800x600x32

VT-x/AMD-V
Disabled

Guest Additions
Not Detected

Guest OS Type
openSUSE

How do I get it enabled ?

Never mind ... it was actually greyed out ( but checked ), and the grey and black colour was too close to each other for me to notice. Now it is enabled.

[jsalvo]

Hmmm ... having AMD-V enabled actually make the guest OS run slower ( e.g. the graphics / screen of the guest OS ... you can see it draw line by line ).

Is that expected ? I would have thought it would have been faster with AMD-V ?

[Muts]

This might be a usefull thread to read:

http://forums.virtualbox.org/viewtopic.php?t=8104