Re: Time problems...

Philip Gladstone (philip@raptor.com)
Wed, 02 Dec 1998 14:22:44 -0500

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This isn't the old interaction with the PC speaker sound driver
is it?

Philip

Riley Williams wrote:
>
> Hi there.
>
> > Whatever it is, it's been consistent across 2.0.33 - 2.0.36 and it
> > *didn't* happen on my older system (486DX2/66) with 2.0.33 kernel
> > --- but I've only observed it on Red Hat 5 and to date I haven't
> > had an RH5 install on the older system (it ran RH4 for over a year
> > without showing any such symptom, but the same applies to some
> > older ECE systems including some with hardware identical to the
> > ones that have severe clock drift).
>
> > The other thing about it is that it's not just lost interrupts:
> > the systems are as apt to *gain* time, instead of losing it, again
> > enough to make Kerberos upset (I've seen them gain 10 minutes over
> > 5 minutes of wall time). Again, I haven't been able to correlate
> > gain vs. loss (or amount thereof) to any particular program or
> > device/driver.
>
> I don't have kernel sources handy to look through, but the above
> sounds suspiciously like something's reprogramming the timer interrupt
> frequency from under us, with the result that the system is getting
> timer interrupts at the wrong rate - that would explain all of the
> above symptoms in one go...
>
> Alan: Can you have a peek through whatever patches RH use in the
> relevant RPM's and check whether there's anything in there that may be
> causing this sort of effect? I doubt it, but it's something that needs
> checking, especially if this is a RH specific problem as is apparently
> being reported.
>
> Best wishes from Riley.
>
> -
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-- 
Philip Gladstone                           +1 781 530 2461
Raptor Systems / Axent Technologies 
Waltham, MA                         http://www.raptor.com/
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