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SubjectRe: 2.6.1 "clock preempt"?
On Fri, Jan 23, 2004 at 11:17:29AM -0800, john stultz wrote:
> On Fri, 2004-01-23 at 11:02, timothy parkinson wrote:
> > On Thu, Jan 22, 2004 at 01:21:45PM -0800, john stultz wrote:
> > > Its likely you need to enable support in the kernel for your IDE
> > > controller, or your DMA on your controller isn't supported.
> >
> > so, apparently the problem was that i just needed to enable dma... which meant
> > that i needed to set "CONFIG_BLK_DEV_VIA82CXXX=y" in my .config.
> >
> > been running all night/morning with load - no "losing ticks" message or slowing
> > clock yet. thanks for pointing me in the right direction.
> >
> > think we could improve that error message? i'd never have guessed that it was
> > hard disk related if you hadn't told me...
>
> Well, lost ticks can be caused by many things, but your point is valid,
> the message could be a bit more elightening.
>
> thanks
> -john
>
>

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... :-)

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