[ntp:questions] Timekeeping best practices for virtualized systems

Rob nomail at example.com
Wed Apr 21 07:17:39 UTC 2010


Terje Mathisen <"terje.mathisen at tmsw.no"> wrote:
> Ryan Malayter wrote:
>> It's from VMware, but I imagine the basics apply to Xen, Hyper-V, and
>> other virtualization solutions:
>> http://kb.vmware.com/selfservice/search.do?cmd=displayKC&docType=kc&externalId=1006427
>
> Very nice indeed, I was particularly intrigued by the fact that with 
> recent kernels it is actually much better to run NTP in the client than 
> to reply on the usual VMware host/client sync!

I am running different Linux kernels (older and newer) under VMware ESX
version 4 but the timekeeping is still worse compared to a physical machine.
You should expect the offset and jitter to be in the several-milliseconds
range on a local network.
It seems that each method of providing timing to the virtual machine has
disadvantages.




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