История изменений
Исправление dyasny, (текущая версия) :
Using the Real-Time Clock with Windows Vista, Windows Server 2008 and Windows 7 guests
Windows uses the both the Real-Time Clock (RTC) and the Time Stamp Counter (TSC). For Windows guests the Real-Time Clock can be used instead of the TSC for all time sources which resolves guest timing issues.
The boot.ini file is no longer used from Windows Vista and newer. Windows Vista, Windows Server 2008 and Windows 7 use the Boot Configuration Data Editor (bcdedit.exe) to modify the Windows boot parameters.
This procedure is only required if the guest is having time keeping issues. Time keeping issues may not affect guests on all host systems.
Open the Windows guest.
Open the Accessories menu of the start menu. Right click on the Command Prompt application, select Run as Administrator.
Confirm the security exception, if prompted.
Set the boot manager to use the platform clock. This should instruct Windows to use the PM timer for the primary clock source. The system UUID ({default} in the example below) should be changed if the system UUID is different than the default boot device.
C:\Windows\system32>bcdedit /set {default} USEPLATFORMCLOCK on
The operation completed successfully
This fix should improve time keeping for Windows Vista, Windows Server 2008 and Windows 7 guests.
Ну и вообще, гуглить time keeping best practices for KVM Windows guests
Исходная версия dyasny, :
Using the Real-Time Clock with Windows Vista, Windows Server 2008 and Windows 7 guests
Windows uses the both the Real-Time Clock (RTC) and the Time Stamp Counter (TSC). For Windows guests the Real-Time Clock can be used instead of the TSC for all time sources which resolves guest timing issues.
The boot.ini file is no longer used from Windows Vista and newer. Windows Vista, Windows Server 2008 and Windows 7 use the Boot Configuration Data Editor (bcdedit.exe) to modify the Windows boot parameters.
This procedure is only required if the guest is having time keeping issues. Time keeping issues may not affect guests on all host systems.
Open the Windows guest.
Open the Accessories menu of the start menu. Right click on the Command Prompt application, select Run as Administrator.
Confirm the security exception, if prompted.
Set the boot manager to use the platform clock. This should instruct Windows to use the PM timer for the primary clock source. The system UUID ({default} in the example below) should be changed if the system UUID is different than the default boot device.
C:\Windows\system32>bcdedit /set {default} USEPLATFORMCLOCK on
The operation completed successfully
This fix should improve time keeping for Windows Vista, Windows Server 2008 and Windows 7 guests.