Re: [Xen-devel] (XEN) Platform timer appears to have unexpectedly wrapped 10 or more times.

[Josip Rodin <joy@xxxxxxxxxxxxxx>]

On Tue, Apr 10, 2012 at 03:59:42PM +0200, Andreas Kinzler wrote:
> >On Tue, Apr 10, 2012 at 02:33:18PM +0200, Andreas Kinzler wrote:
> >>I have the same problem. Do you use ntpd? Which version? I suspect
> >>some link between the problem and ntpd.
> >But ntpd is still a userland program, shouldn't the kernel exert the
> >ultimate control over who gets to screw with the system's clock source?
> >In any case, I did a quick grep of ntpd sources and found references to
> >RDTSC only in the Windows port, so the link doesn't seem obvious.
> 
> Right, there is no obvious link (but which hard to reproduce bug is
> obvious?) but see
> "http://lists.xen.org/archives/html/xen-devel/2011-10/msg01269.html";.
> There seems to be some connection.

>From that (garbled) log, I don't see it - you didn't even post the matching
kernel log message with timestamp, so it's impossible to see if and when
it coincided when the ntpd messages.

Over here we're running ntpd, obviously, in dom0 and in domU, but the only
observed interaction of this problem with ntpd is that they become useless
with this kind of a major drift.

-- 
     2. That which causes joy or happiness.

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