Re: Linux 2.6.29-rc6

[Jesper Krogh]

Linus Torvalds wrote:
> On Sun, 15 Mar 2009, Jesper Krogh wrote:
> > Linus Torvalds wrote:
> > > Regardless of whether is succeeds or not, it will print out some debug
> > > messages, which will be interesting to see.
> >
> > [    0.000000] Fast TSC delta=34227730, error=6223+6219=12442
> > [    0.000000] Fast TSC calibration using PIT
> > [    0.000000] Detected 2312.045 MHz processor.
>
> Ok. This claims that the error really is smaller than 500ppm (it's about 
> 360 ppm). Which is about what we're aiming for (in real life, the actual 
> error is about half that - we're just adding up the error terms for 
> maximum theoretical error).
>
> > Using "ntpq -c peers" .. the offset steadily grows as time goes.
> >
> > Full dmesg: http://krogh.cc/~jesper/dmesg-linux-2.6.29-rc8-linus1.txt
> >
> > jk@quad11:~$ ntpdc -c kerninfo
> > pll offset:           0.085167 s
> > pll frequency:        -18.722 ppm
> > maximum error:        0.137231 s
> > estimated error:      0.008823 s
> > status:               0001  pll
> > pll time constant:    6
> > precision:            1e-06 s
> > frequency tolerance:  500 ppm
>
> Hmm. But now it all seems to _work_, no? Or do you still get time resets? 

My conclusion was that I would get a time reset after some time since 
the offset just increased as time went by (being reasonably small at the
beginning).

I had it up for around 30 minutes... Should I have tested longer?

I went on to trying Thomas Gleixners patch (which seems to do excactly 
the same .. ), I'll write a reply in to that message in a few minutes.

--
Jesper
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/