Re: [Xen-users] guest os time drift wild

[Steven Timm <timm@xxxxxxxx>]

On Tue, 10 Apr 2012, Chieu wrote:

> thank you for help.
>
> The special is when the time jumps forward， then the time won't change
> and keep the time always。
>
> for example, the time jumps to 4:00 from 3:30， then the time keeps 4:00。
Yes, I see exactly the same problem.  It has been there for years.

Steve Timm


> 2012/4/9 Steven Timm <timm@xxxxxxxx>:
> > On Mon, 9 Apr 2012, Chieu wrote:
> >
> > > HI, guys
> > >
> > > Recently,I met a problem.
> > > Xen's version: 3.4.3
> > > guest os:redhat 4.8 32bit
> > >
> > > And xen.independent_wallclock = 1 has been set.
> > >
> > > The time of guest os change to be fast suddenly, about 2000 second.
> > > because the change is too wild, ntp didn't sync to the ntp server's time.
> > >
> > > my application is dependent on the systme time. And this occurs a lot of
> > > times.
> > >
> > > I don't know which situation will cause this problem.
> >
> > I have seen this with many different versions of Redhat 32-bit
> > guests (4.x and 5.x) on Xen from 3.1 upwards.  Never found a fix besides
> > migrating all my guests to 64-bit.  independent_wallclock is
> > better than not, but I see exactly the same problem that the clock
> > jumps forward by 20-40 minutes and then just holds there until
> > real time catches up to it.
> >
> > Steve Timm
> >
> >
> > > Does anyone can help me ?
> > >
> > > thank you!
> > >
> > > sincerely
> > >
> > > chieu
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxx
> > > http://lists.xen.org/xen-users
> > ------------------------------------------------------------------
> > Steven C. Timm, Ph.D  (630) 840-8525
> > timm@xxxxxxxx  http://home.fnal.gov/~timm/
> > Fermilab Computing Division, Scientific Computing Facilities,
> > Grid Facilities Department, FermiGrid Services Group, Group Leader.
> > Lead of FermiCloud project.
------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Group Leader.
Lead of FermiCloud project.

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