On 19/09/13 06:41, Riccardo Castellani wrote:
one the problem ? Virtualization ? I'd like to know if ntpd adjusts only OS time or it adjust hardware clock too.
ntpd only adjusts the software clock, however, the guest OS may well try to update the hardware clock. Normal VM hosts will virtualise the hardware clock, so this should not affect the host.
The basic problems with running ntpd on VMs are that simulated real time can run at variable rates, compared with true real time, and there can be large scheduling delays, which compromise the accuracy of offset measurement.
Both can result in very large jitters and make it difficult for ntpd to work out the underlying clock frequency error.
_______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
