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    SubjectRe: 2.6.17-mm2 hrtimer code wedges at boot?
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    On Thu, 2006-07-06 at 02:37 +0200, Roman Zippel wrote:
    > Hi,
    >
    > On Wed, 5 Jul 2006, Valdis.Kletnieks@vt.edu wrote:
    > > [ 29.528533] Time: tsc clocksource has been installed.
    > > [ 29.552855] clock changed at -296333 (4294314460971008)
    > > [ 29.577109] clock tsc: m:2628985,s:22,cl:47171945132,ci:1595166,xn:0,xi:4193667486510,e:0
    > > [ 29.601869] big adj at -296332 (4294314460971008,-16,-25522656,-11031712)
    > > [ 29.626688] clock tsc: m:2628985,s:22,cl:47288392250,ci:1595166,xn:148610636380190,xi:4193667486510,e:-76300711936
    > > [ 29.652263] big adj at -296331 (4294314460971008,512,816724992,737704960)
    > > [ 29.677968] clock tsc: m:2628969,s:22,cl:47368150550,ci:1595166,xn:358292745604602,xi:4193641963854,e:1193037240320
    >
    > Ok, I see now the problem, the last cycle value is always at least 50
    > times incremented between adjustments and that also means any error
    > adjustment is applied at least 50 times, which quickly gets out of
    > control.
    > Is it possible that your console output is really slow? Otherwise I can't
    > explain these numbers, everything looks initialized fine for a 1.6GHz
    > clock, but it seems to take ages to print a single line.

    Dang! You beat me to the analysis :) I think we're on the same page
    here.


    > I have to run some tests and later this week there should be a new patch
    > compensating for this.

    Look forward to it.

    > John, now I also know why your version survived this, it did the error
    > correction in the update loop, this kept error small, but it also caused
    > the time to jump around, since it changed the multiplier in the past.

    Yep, agreed.

    thanks
    -john

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