Re: [Xen-devel] [PATCH 2/3] timekeeping: sync persistent clock and RTC on system time step changes

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, May 28, 2013 at 12:09:14PM -0700, John Stultz wrote:
> On 05/28/2013 11:31 AM, Konrad Rzeszutek Wilk wrote:
> >On Tue, May 28, 2013 at 07:26:14PM +0100, David Vrabel wrote:
> >>On 15/05/13 19:10, John Stultz wrote:
> >>>Ok, so really, as soon as the Dom0 time is set by NTP, all guests will
> >>>see the right time? That makes more sense, and means the window for
> >>>these sorts of issues is reasonably quite small.
> >>It's a small window but it's occurring in our automated test system.
> >>
> >>>David: So I'm less inclined to merge this individual change, but if you
> >>>still feel strongly about it, let me know and we can circle around on it
> >>>after you've addressed the specific issues I pointed out earlier.
> >>This patch was the actual bug fix but I've reworked it to use the
> >>pvclock_gtod notifier chain as this seemed to be what KVM hosts were
> >>using to maintain a clock for guests.  Please review the new series, thanks.
> >Looks good.
> >
> >John if you are OK I am thinking to push this to Linus shortly as it is
> >fixing a bug.
> 
> I'm really not sure I'd call this a bug.  That seems like an
> over-reaction to a misconfigured system.
> 
> Or if there is a bug, I'm not sure its been clearly explained.

The #1 patch - b/c you try to set the RTC time and it actually never takes. Meaning
on the next time the machine is booted the time is again off.
> 
> thanks
> -john
> 
> 
>