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

From: john stultz (johnstul_at_us.ibm.com)
Date: 11/14/05

  • Next message: Serge E. Hallyn: "[RFC] [PATCH 04/13] Change pid accesses: include/." 
    To: Frank Sorenson <frank@tuxrocks.com>
Date:	Mon, 14 Nov 2005 13:38:45 -0800

    On Mon, 2005-11-14 at 14:22 -0700, Frank Sorenson wrote:
    > -----BEGIN PGP SIGNED MESSAGE-----
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    > john stultz wrote:
    > > All,
    > > I had hoped to submit this to -mm today, but since Ingo pointed
    > > out an issue in the __delay code, I'm going to wait a week so the new fix
    > > can be better tested.
    >
    > I replaced the TOD parts of the kthrt patchset with TOD B10. It seems
    > there is something wrong with 'c3tsc' and 'pit', though.
    >
    > c3tsc appears to run fast:
    > 14 Nov 12:02:13 offset: -0.00247 drift: -2502.0 ppm
    > 14 Nov 12:03:14 offset: -0.145203 drift: -2342.5 ppm
    > 14 Nov 12:04:14 offset: -0.329381 drift: -2700.10655738 ppm
    > 14 Nov 12:05:14 offset: -0.532767 drift: -2927.46703297 ppm
    > 14 Nov 12:06:15 offset: -0.638096 drift: -2626.04115226 ppm

    Hmm... Not sure if this is mis-calibration or just bad-interaction w/
    kthrt. Mind sending a dmesg to me?

    > and 'pit' seems to produce errors (system will not switch from pit to
    > another clocksource anymore):

    Do the TOD patches have this issue by themselves, or is this only with
    kthrt? I know I had some issues with non-continuous clocksources (pit,
    jiffies) with the kthrt patch, where it wouldn't fall back to
    non-high-res when the clocksource stopped supporting it.

    thanks
    -john

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