Time going backwards 2005-12-03 - By Ed Wilts
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On Sat, Dec 03, 2005 at 06:26:34PM +0100, Arjan van de Ven wrote:
> On Sat, 2005-12-03 at 11:22 -0600, Ed Wilts wrote:
> > I'm working with a 3rd party vendor whose software isn't happy with our
> > time going backwards. This is happening even without ntp running. It
> > isn't consistent on all systems, but I've got at least 2 DL380 dual-cpu
> > systems that have this issue. So far I've seen it only on these 2 DL380
> > systems (both happen to have fiber cards in them). Other DL380s running
> > the same release don't have the problem (but none have fiber cards -
> > whether that has any bearing on the problem or not I don't know). These
> > are all running fully up2date RHEL 3. All have hyperthreading enabled
> > on 3.06 Ghz Xeon processors.
>
>
> try booting with "notsc" as kernel option.... in modern servers the
> cpu's tsc counter is no longer reliable for time keeping...
Thanks, Arjan, I'll give that a try. What should the vendor be using
for time keeping if not the tsc counter? I'm not a developer, but I'd
like to tell him what he should have done instead.
What are the drawbacks to adding notsc? I assume there would be some or
it would be the default, wouldn't it?
.../Ed
--
Ed Wilts, RHCE
Mounds View, MN, USA
mailto:ewilts@(protected)
Member #1, Red Hat Community Ambassador Program
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