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Os x clock not updating

I have noticed that our VMWare VMs often have the incorrect time on them.No matter how many times I reset the time they keep on desyncing. What do other people do to keep their VM time in sync? according to VMware's knowledge base, the actual solution depends on the Linux distro and release, in RHEL 5.3 I usually edit /etc/and append this parameters to the kernel entry: divider=10 clocksource=acpi_pm Then enable NTP, disable VMware time synchronization from vmware-toolbox and finally reboot the VM A complete table with guidelines for each Linux distro can be found here: TIMEKEEPING BEST PRACTICES FOR LINUX GUESTS language=en_US&cmd=display KC&external Id=1006427 I'll answer for Windows guests.

We turned that off and now the guest clocks are good, getting their time exclusively from the ESXi host.In my case we are running VMWare Server 2.02 on Windows Server 2003 R2 Standard. I had the VMware Tools installed and set to sync the time.I did everything imaginable that I found on various internet sites.We still had horrendous drift, although it had shrunk from 15 minutes or more down to the 3 or 4 minute range. for additional information." Cause: 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.Finally in the I found this entry (resides in the folder as the file): "Your host system does not guarantee synchronized TSCs across different CPUs, so please set the /usepmtimer option in your Windows file to ensure that timekeeping is reliable. Multi core or multiprocessor systems may encounter Time Stamp Counter (TSC) drift when the time between different cores is not synchronized.The operating systems which use TSC as a timekeeping resource may experience the issue.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.Other available timers include the PM_Timer and the High Precision Event Timer (HPET).Resolution: To resolve this problem check with the hardware vendor to see if a new driver/firmware update is available to fix the issue.Note The driver installation may add the /usepmtimer switch in the file.Once this (/usepmtimer switch) was done the clock was dead on time. I originally noticed this because VMware gave me a helpful tip on my laptop, but this page mentions the same thing: Quote from : VMWare tips and tricks Power saving (Speed Step, C-states, P-States,...) Your power saving settings may interfere significantly with vmware's performance. CPU frequency This should not lead to performance degradation, outside of having the obvious lower performance when running the CPU at a lower frequency (either manually of via governors like "ondemand" or "conservative").

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