Re: [chrony-users] gpsd, pps and chrony

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On 06/04/2011 21:58, Miroslav Lichvar wrote:
> On Wed, Apr 06, 2011 at 07:18:24PM +0100, Ed W wrote:
>> - I see a clear connection between my cpu Mhz as reported in say
>> /proc/cpuinfo (unknown if this source is reliable when processor
>> powersave in use?) and the stable chrony tracking parameters
> At least here, MHz in /proc/cpuinfo is affected by powersaving and it
> is a nicely rounded value, not what kernel prints in dmesg.
>> I'm quite surprised that others don't see this gross variation that I
>> do?  For me at least I get no value at all from chrony's saved tracking
>> params because chrony is tracking an average offset of around 130ppm,
>> but the bootup variation is some 100+ ppm around that offset?  Do others
>> get less variation with each boot?
> I just made a test with a 2.6.38-rc0 kernel and I have good
> news for you :). I noticed this in dmesg:
> Detected 3192.489 MHz processor.
> Refined TSC clocksource calibration: 3191.999 MHz

Hmm, will give it a try shortly.

> It seems to be this commit, merged just few months ago.

Ahh, interesting - sadly the Alix has no PM or HPET timers so I think
this is unlikely to help *my* specific case, but it's very good news in

Ed W

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