[CentOS] system time automatically fowards in time and then comes back to normal

Alexander Dalloz ad+lists at uni-x.org
Sun Nov 22 17:52:35 UTC 2009

Benjamin Franz schrieb:
> nate wrote:
>> Akemi Yagi wrote:
>>> for VMware products including ESX and ESXi.  According to their
>>> current recommendations, " In all cases use NTP instead of VMware
>>> Tools periodic time synchronization."
>> I've been using vmware for 10 years, and I've never, ever ever
>> gotten NTP to hold sync inside of a VM outside of using a VMI
>> enabled kernel.
> I've got more than 20 VMs spread over 5 machines (VMware Server 2.x), 
> both 32 and 64 bit (hosts and VMs) that hold time perfectly using NTP.
> 1) Make *SURE* that 'cpuspeed' and any BIOS 'power saving' modes are 
> disabled on your host and your VMs. Nothing screws timekeeping like 
> having the CPU speed vary.
> 2) Use 'divider=10' on your grub kernel boot lines for your virtual 
> machines.

That kernel parameter information is out of date with CentOS 5.4:


As Akemi said, users of VMware virtualization products (bare metal
hypervisor products like ESX/ESXi and the other solutions) should
closely follow the KB article recommendations which are frequently updated.


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