So, if time sync is disabled, you can enable it by running the following command line in the guest: VMwareService.exe –cmd “vmx.set_option synctime 0 1″įor some (IMHO stupid) reason, this utility requires you to specify the current as well as the new value (I assumed it would be posible to set this as a parameter / config option during tools install)Īfter a bit of searching I found a way to do this in a VMware article called “Using the VMware Tools Command-Line Interface“. Surprisingly, this wasn’t quite as straightforward as I expected. There a several ways to do this from outside the VM, but I wanted to find a way to enable time sync from within the guest itself either on or after tools install. However – “best practise” is to enable time synch on Windows Guests. When installing VMware Tools on a Windows Guest, “Time Synchronisation” is not enabled by default. Once this (/usepmtimer switch) was done the clock was dead on time.
Virtual timeclock server windows 10 driver#
Note The driver installation may add the /usepmtimer switch in the Boot.ini file.
Virtual timeclock server windows 10 update#
Resolution: To resolve this problem check with the hardware vendor to see if a new driver/firmware update is available to fix the issue. Other available timers include the PM_Timer and the High Precision Event Timer (HPET). Newer operating systems typically do not use the TSC by default if other timers are available in the system which can be used as a timekeeping source. The operating systems which use TSC as a timekeeping resource may experience the issue. Multi core or multiprocessor systems may encounter Time Stamp Counter (TSC) drift when the time between different cores is not synchronized. for additional information."Ĭause: This problem occurs when the computer has the AMD Cool'n'Quiet technology (AMD dual cores) enabled in the BIOS or some Intel multi core processors. "Your host system does not guarantee synchronized TSCs across different CPUs, so please set the /usepmtimer option in your Windows Boot.ini file to ensure that timekeeping is reliable. We still had horrendous drift, although it had shrunk from 15 minutes or more down to the 3 or 4 minute range.įinally in the vmware.log I found this entry (resides in the folder as the.
I did everything imaginable that I found on various internet sites. I had the VMware Tools installed and set to sync the time. The Host is also Windows Server 2003 R2 Standard. In my case we are running VMWare Server 2.02 on Windows Server 2003 R2 Standard.
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