Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4]

Ingo Molnar
2004-11-01T22:34:06Z

* Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> wrote:

> Did notice an odd message during the dump of tasks...
> Losing too many ticks!
> TSC cannot be used as a timesource.
> Possible reasons for this are:
> You're running with Speedstep. [almost surely not]
> You don't have DMA enabled for your hard disk (see hdparm), [udma4 should
> be set at this point]
> Incorrect TSC synchronization on an SMP system (see dmesg). [can't look
> at that, system is hung]
> Falling back to a sane timesource now.

this is just due to the messages going out to the serial console slowly
and with interrupts disabled. You can safely ignore this during the
dump, the system wont get into any much worse state from this. So it's a
pure side-effect.

Ingo