Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ, CONFIG_HIGH_RES_TIMERS

Thomas Gleixner
2007-05-01T15:22:08Z

On Tue, 2007-05-01 at 10:13 -0400, Mark Lord wrote:
> Thomas Gleixner wrote:
> > On Tue, 2007-05-01 at 09:34 -0400, Mark Lord wrote:
> >>> now at 3232363876949 nsecs
> >> ...
> >>
> >> Oh, in case it matters any:
> >> that /proc/timer_list is from the system with CFS-V7 also patched in.
> >
> > It should not. What happens when you disable HPET ?
>
> Booting with clocksource=tsc still hangs in what appears
> to be the exact same place.

I meant disable HPET via: hpet=disable on the commandline

> Screenshots for that are available here: http://rtr.ca/hrtimers/
>
> Of possible interest is that the bottom of the 25line screen capture
> differs somewhat from the 50line capture.. see for yourself.
> This is 100% consistent from boot to boot.
>
> Using CONFIG_DETECT_SOFTLOCKUP=y eliminates the problem,
> so that's really got to be a huge clue, somehow ?

Unfortunately not. Other than it runs the watchdog task once a second it
does not affect the time/clockevent... mechanisms at all

tglx