linux-kernel - Re: 2.6.21-rc7: HPET enabled freeze my machine at boot

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Date:	Mon, 23 Apr 2007 15:30:28 -0700
From:	john stultz <johnstul@...ibm.com>
To:	"Guilherme M. Schroeder" <guilherme@...tralinf.com.br>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.21-rc7: HPET enabled freeze my machine at boot

On Sat, 2007-04-21 at 20:07 -0300, Guilherme M. Schroeder wrote:
> john stultz wrote:
> > On 4/19/07, guilherme <guilherme@...tralinf.com.br> wrote:
> >> Hi,
> >>
> >> If i enable "High Resolution Timer Support", my machine stops here at 
> >> boot:
> >>
> >> Clocksource tsc unstable (delta = -297340790165 ns)
> >> Time: hpet clocksource has been installed.
> >>
> >> If i disable HPET, it boots fine.
> > 
> > Hmmm.. What happens if you boot w/ clocksource=acpi_pm ?
> > 
> > 
>
> Boot ok with clocksource=acpi_pm and HPET enabled.
> Any clue?

I'm suspecting that your HPET counter is being stopped for some reason,
although why I have no idea.

Just to get a clear picture, does this happen w/ "Tickless System
(Dynamic ticks)" disabled in the menuconfig?

Thomas, might we be actually stopping the HPET counter instead of
disabling the HPET interrupt w/ dynticks?

thanks
-john

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