[ntp:questions] NTP Servers in virtual machines
David Woolley
david at ex.djwhome.demon.invalid
Mon Jun 23 11:28:53 UTC 2014
On 23/06/14 12:03, Rob Heemskerk wrote:
> As kernels are tickles nowadays response times to clock interrupts and (interrupt backlogs) do not seem to be relevant anymore.
Tickless kernels still use clock interrupts; they just schedule them
only when actually needed. In fact they can make it worse, in that they
can tweak the timing so as to aggregate several wakeups.
>
> Could we say it is safe to run ntp servers on a virtualized platform or do we still need a few (4?) dedicated pieces of hardware to run our internal NTP servers?
No.
Normal virtualised machines are not intended for hard realtime
applications. Also, the host clock can and should be disciplined using
NTP, so there is a risk double correction.
More information about the questions
mailing list