Re: [PATCH 0/13] Time: Generic Timeofday Subsystem (v B10)

john stultz
2005-11-15T19:53:40Z

On Mon, 2005-11-14 at 22:04 -0700, Frank Sorenson wrote:
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> john stultz wrote:
> > Hrm.. How about sending a dmesg of just vanilla 2.6.14-mm2? Also does
> > the behavior change booting w/ idle=poll ?
>
> idle=poll does seem to fix the major clock drift problem. There may
> still be an issue, but it's much smaller:
>
> 2.6.14-mm2-todb10:
> 14 Nov 21:50:57 offset: -0.025373 drift: -22404.0 ppm
> 14 Nov 21:51:59 offset: -1.577053 drift: -24985.4603175 ppm
> 14 Nov 21:53:00 offset: -3.104569 drift: -25012.9032258 ppm
>
> 2.6.14-mm2-todb10 with idle=poll:
> 14 Nov 21:37:59 offset: 5.9e-05 drift: 63.0 ppm
> 14 Nov 21:39:00 offset: 0.003207 drift: 51.7903225806 ppm

Hmm. It seems the c3 compensation is triggering when it shouldn't, or
maybe its over compensating.

I can't reproduce it on my laptop. Do you recall if in previous tests
you saw anything like this? I'm trying to narrow down if its just a
difference in hardware or if something in the c3 idle code changed.

thanks
-john