Re: CPU hyperthreading turned on after soft power-cycle

[Jiri Polach]

> > > > Finally! After another 50+ compilations a have it! It took some time as
> > > > first I had to find a reason why some revisions did not boot (almost 2/3
> > > > were unbootable and the first bad commit was among them). Having this
> > > > solved I have been able to bisect without "skipping". The result is
> > > > surprising (at least for me) - believe it or not, the first bad commit
> > > > is 6610e089 "RTC: Rework RTC code to use timerqueue for events" from
> > > > John Stultz (I am sending him a copy of this message).
> > > >
> > > > I would never expect this would be a problem, but my understanding of
> > > > this commit is very limited, so I am certainly missing the point.
> > > > However, I have tried to compile 2.6.38 (which was "bad") with "Real
> > > > Time Clock" configuration option turned off and it behaves "normally"
> > > > then (= is "good").
> > >
> > > Huh. That's *very* odd.  Is your system doing anything in-particular
> > > with the RTC?  I don't have a clue right off, so probably the next step
> >
> > Yes, it is very odd. The system does not do anything special with RTC.
> > It is a diskless computational workstation.
> >
> > > is doing a bit of instrumentation to try to figure out where exactly we
> > > trigger the behavior. Could you checkout commit 6610e089 and apply the
> > > patch below to see if we can't narrow it down?
> >
> > With the patch applied the system does not show the strange behavior (=
> > is "good").
> >
> > > Could you also send your .config to me?
> >
> > Sure. It is attached. I have found that if I turn CONFIG_RTC_DRV_CMOS
> > off, the system behaves normally (= is "good") too.
>
> Yea. My rough guess is that the BIOS is somehow sensitive to how the
> CMOS RTC is touched.
>
> Does disabling CONFIG_HPET_EMULATE_RTC change the behavior?

But how do I do it? :-)

I have not found a way to disable it in "menuconfig". If I comment it 
out manually in .config, it is automatically set back to "y" as soon as 
compilation starts ...

Thanks,

Jiri


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