Hi Carsten --
I think domain0 (and all PV domains) only use the
one paravirtualized clock based on xen system time.
Changing clock options such as hpet and notsc will
not affect a PV domain, only an HVM domain.
Dan
> -----Original Message-----
> From: Carsten Schiers [mailto:carsten@xxxxxxxxxx]
> Sent: Friday, April 03, 2009 11:11 AM
> To: Dan Magenheimer; xen-devel
> Cc: Tim.Deegan
> Subject: AW: RE: [Xen-devel] Huge Time went backwards
>
>
> > Interesting. This is reported booting dom0, correct? Are
> > you running NTP in dom0?
>
> It's in Dom0 log when powernow-k8 is loaded, which is after
> loading loop
> and prior on
> mounting disks. Roughly 4 seconds prior to starting ntpd, so
> I guess it
> has no interaction.
>
> It feels a bit like that 3.3.1 and 3.4 set values differently
> in the CPU
> cores, because
> when rebooting the same Xen version two or three times again,
> it's away.
> It will come back
> with either Xen version when you switch version. At least it
> feels that
> way.
>
> >> If I get on your nerves with my time keeping issues
> >
> >No, it is good to raise awareness of these issues until they
> >are all fixed. ESPECIALLY if you see time problems in xen-unstable,
> >it would be good to get them fixed before 3.4 is final.
>
> Unfortunately, I broke my unstable. Also, it's a
> semi-productive family
> server, so slots to
> Test are a bit rare. I try my best to set it up again and do more
> testing.
>
> I have this Time went backwards issues from the beginning.
> Now I tried
> to set HPET to 32bit,
> although I don't know whether a) BIOS is read to use 32bit instead of
> 64bit, or b) this makes
> any difference, or c) HEPT and TSC have something in common when it
> comes to TSC drifts related
> to power management.
>
> I also wondered, whether I should try booting with notsc, but it's a
> dual core and I think then
> I need TSC, or don't I?
>
> BR,
> Carsten.
>
>
> -----Original Message-----
> From: Carsten Schiers [mailto:carsten@xxxxxxxxxx]
> Sent: Friday, April 03, 2009 6:52 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Huge Time went backwards
>
>
> Just an observation, to whom it may concern: when booting
> between 3.3.1
> and
> current xen-3.4-unstable, right after loading powernow-k8,
> there will be
> one huge
> Time went backwards messages (500ms upt to 1,5s), which disappears
> unless
> you change Xen version again.
>
> BTW: If I get on your nerves with my time keeping issues, just drop a
> note and
> I keep calm ;-).
>
> BR,
> Carsten.
>
>
>
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