Sun Microsystems 3.0.0 Manual De Usuario
9 Advanced topics
"Host BIOS Version"
VBoxManage setextradata "My VM"
"VBoxInternal/Devices/pcbios/0/Config/DmiBIOSReleaseDate"
"Host BIOS Release Date"
VBoxManage setextradata "My VM"
"VBoxInternal/Devices/pcbios/0/Config/DmiBIOSReleaseMajor"
1
VBoxManage setextradata "My VM"
"VBoxInternal/Devices/pcbios/0/Config/DmiBIOSReleaseMinor"
2
VBoxManage setextradata "My VM"
"VBoxInternal/Devices/pcbios/0/Config/DmiBIOSFirmwareMajor"
3
VBoxManage setextradata "My VM"
"VBoxInternal/Devices/pcbios/0/Config/DmiBIOSFirmwareMinor"
4
If a DMI string is not set, the default value of VirtualBox is used. To set an empty
string use "<EMPTY>".
Changing this information can be necessary to provide the DMI information of the
host to the guest to prevent Windows from asking for a new product key. On Linux
hosts the DMI BIOS information can be obtained with
hosts the DMI BIOS information can be obtained with
dmidecode -t0
and the DMI system information can be obtained with
dmidecode -t1
9.15 Configuring the guest time stamp counter (TSC)
to reflect guest execution
By default, VirtualBox keeps all sources of time visible to the guest synchronized to a
single time source, the monotonic host time. This reflects the assumptions of many
guest operating systems, which expect all time sources to reflect “wall clock” time. In
special circumstances it may be useful however to make the TSC (time stamp counter)
in the guest reflect the time actually spent executing the guest.
single time source, the monotonic host time. This reflects the assumptions of many
guest operating systems, which expect all time sources to reflect “wall clock” time. In
special circumstances it may be useful however to make the TSC (time stamp counter)
in the guest reflect the time actually spent executing the guest.
This special TSC handling mode can be enabled on a per-VM basis, and for best
results must be used only in combination with hardware virtualization. To enable this
mode use the following command:
mode use the following command:
VBoxManage setextradata "My VM" "VBoxInternal/TM/TSCTiedToExecution" 1
To revert to the default TSC handling mode use:
VBoxManage setextradata "My VM" "VBoxInternal/TM/TSCTiedToExecution"
Note that if you use the special TSC handling mode with a guest operating system
which is very strict about the consistency of time sources you may get a warning or
error message about the timing inconsistency. It may also cause clocks to become
unreliable with some guest operating systems depending on they use the TSC.
error message about the timing inconsistency. It may also cause clocks to become
unreliable with some guest operating systems depending on they use the TSC.
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