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    SubjectRe: 2.6.1 "clock preempt"?

    On Fri, Jan 23, 2004 at 12:06:45PM -0800, john stultz wrote:
    > On Fri, 2004-01-23 at 11:36, timothy parkinson wrote:
    > > On Fri, Jan 23, 2004 at 11:17:29AM -0800, john stultz wrote:
    > > > Well, lost ticks can be caused by many things, but your point is valid,
    > > > the message could be a bit more elightening.
    > >
    > > googling for this issue turns up quite a few questions about it - there's
    > > already one possible answer in the source, couldn't hurt to stick in a few
    > > more:
    > >
    > >
    > > if (lost_count++ > 100) {
    > > printk(KERN_WARNING "Losing too many ticks!\n");
    > > printk(KERN_WARNING "TSC cannot be used as a timesource.\n"
    > > "Are you running with SpeedStep?\n"
    > > + "Perhaps you should enable DMA using \"hdparm\"?\n"
    > > + "etc..........)\n");
    > > printk(KERN_WARNING "Falling back to a sane timesource.\n");
    > > clock_fallback();
    > > }
    > >
    > > not that you have to actually listen to me or anything... :-)
    >
    > Looks good by me. Would you mind sending such a patch to Andrew?
    >
    > thanks
    > -john
    >

    no problem, i'll take it from here.

    * Running with SpeedStep (this is a cpu thing i assume?) could cause this.
    * Not having DMA enabled on your hard disk(s) could cause this. See the hdparm
    utility to enable it.
    * Incorrect TSC synchronization on SMP systems could cause this.
    * Anything else?

    thanks,

    timothy

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