Re: Validating PHC operation on Microsoft VM

I synchronized the host using chrony and nearby stratum 1's and then
compared the PHC time to the host time.
The results are bizarre.   I have only oneVM, so this result might not hold
elsewhere.
Miroslav suggests this might be a hyper-v issue.

Hope this image gets through the mailing list.  If not, I'll post it
elsewhere.
[image: image.png]

On Wed, Feb 26, 2025 at 2:22 AM Miroslav Lichvar <[email protected]>
wrote:

> On Wed, Feb 26, 2025 at 12:59:20PM +0800, Mingye Wang wrote:
> > I can see why Microsoft Azure picked that option: they don't want to
> > overload the NTP pool (like I've complained about recently)[1], but
> > their approach is a bit off. Specifically, I believe they should have
> > specified a nonzero stratum so that chrony does not place too much
> > trust in the host time. Is there anyone from Azure that I can contact
> > on this issue?
>
> If there is only one source, it doesn't matter what stratum it has.
> Its weight can change only relative to other sources.
>
> If you want to propose changes to the default configuration, you will
> need to find out where it is coming from. There could be a base image
> provided by the OS vendor and other changes layered on top maintained
> elsewhere. Not easy to follow. I think most of the Azure stuff is on
> github.
>
> --
> Miroslav Lichvar
>
>
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