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Message-ID: <49BD4B2D.7000501@krogh.cc>
Date: Sun, 15 Mar 2009 19:38:37 +0100
From: Jesper Krogh <jesper@...gh.cc>
To: Linus Torvalds <torvalds@...ux-foundation.org>
CC: john stultz <johnstul@...ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Len Brown <len.brown@...el.com>
Subject: Re: Linux 2.6.29-rc6
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@...d11:~$ 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
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