On 23/06/14 13:12, Miroslav Lichvar wrote:
I think it all depends on the VM implementation and what clocksource is used in the guest. If the guest is using tsc (i.e. its frequency is independent of the host clock), it will need to run its own NTP
It will still be subject to potentially large scheduling delays between NTP packet arrival and processing. Also, unless you restrict VM to a single host, the TSC could jump and change frequency when the VM is moved. If it is impossible to virtualise TSC, it is impossible to hide those jumps.
Generally you are going to put ntpd on a VM because the IT manager doesn't consider it very important. If it is not important, he is probably not going to worry about the effect of moving it around hosts.
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