Re: [Xen-users] Changing gears with wallclocks

["Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>]

On 31 Jan 2007 at 14:38, Tim Post wrote:

> Good day to all, 
> 
> Does anyone know if altering the clock type (turning on independent
> clocks via the proc/ setting) goes into effect immediately, or is a
> re-start of the guests needed before this setting takes effect?

>From my experience, the effect of changing a sysctl value (which that is), 
>takes 
immediate effect until reboot (i.e. the value is not remembered). That should 
answer your question. Also, you can read back the value at any time.

> 
> I would just experiment and see, but my guests are in production and I'd
> like to avoid an intentional time warp just to see if the settings stay
> independent, all of them are busy time stamping various things.
> 
> I need to setup a ntp server on just one of the guests that runs just a
> few seconds behind real time, but leave the rest of the guests on real
> time honing into a 'true' ntp server. Am I being over-optimistic
> thinking I can do this without stop/starting the guests?

The above said, it seem natural that a restart of the NTP services makes sense 
after having changed the kernel clock algorithm.

Regards,
Ulrich


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