Re: [Xen-devel] [PATCH 0/3] xen: fix various wallclock problems

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-10-12 at 17:25 +0100, David Vrabel wrote:
> On 12/10/12 13:57, David Vrabel wrote:
> > This series (with some toolstack updates) corrects a number of cases
> > where a guest can see an incorrect wallclock time.
> > 
> > 1. Systems with NTP won't periodically synchronize the hardware RTC so
> > the wallclock may be incorrect after a reboot.
> > 
> > 2. The wallclock is always ~500 ms behind the correct time.
> > 
> > 3. If the system time was stepped and NTP isn't synchronized yet, the
> > wallclock will still have the incorrect time.  The fix for this
> > requires the toolstack to synchronize the wallclock -- patch #3
> > provides the mechanism for this.
> 
> These tables should help.
> 
> Before:
> 
>               |                Updates
> Process             | System Time?  Xen Wallclock?  Hardware Clock?
> -------------------------------------------------------------
> date -s       | X
> hwclock -w    |                               X
> ntpd          | X             X[*]
> ntpdate       | X

What does the equivalent table for native look like?

Is the "updated hardware clock" column in that caseis union of xen
wallclock and hardware clock columns here?

Ian.


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