[ntp:questions] Re: ntpd server on Linux/Debian with SPARC Sun Blade 100

Uwe Klein uwe_klein_habertwedt at t-online.de
Thu Oct 19 21:28:10 UTC 2006


David Woolley wrote:
> In article <20061019141410.GH12952 at puck.ch>,
> Olivier.Bornet at puck.ch (Olivier Bornet) wrote:
> 
>>On Thu, Oct 19, 2006 at 01:23:36PM +0200, Uwe Klein wrote:
>>
>>>i had a similar problem the other way round ( clock gaining) while your
>>>clock seems to be loosing.
> 
> 
> Gaining can happen for the other two reasons mentioned below, but it
> excludes lost interrupts.

Just to have it on record:
Clock gaining fast on Linux is in my case connected to nVidia nForce 1/2
based Motherboards of certain revisions.
If the Timer interrupt is routed via APIC and ( in some cases) Spread Spectrum
is activated in the BIOS this interrupt will be handled twice on occasion.

this appears in the logfile as:
13 Aug 15:17:46 ntpd[11378]: synchronized to LOCAL(0), stratum 10
13 Aug 15:18:50 ntpd[11378]: kernel time sync enabled 0001
13 Aug 16:04:57 ntpd[11378]: synchronized to 123.33.160.1, stratum 2
13 Aug 16:21:59 ntpd[11378]: time reset -2.118908 s
13 Aug 16:26:15 ntpd[11378]: synchronized to LOCAL(0), stratum 10
13 Aug 16:56:25 ntpd[11378]: synchronized to 123.33.160.1, stratum 2
13 Aug 17:13:26 ntpd[11378]: time reset -1.731393 s
13 Aug 17:17:45 ntpd[11378]: synchronized to LOCAL(0), stratum 10
13 Aug 17:30:45 ntpd[11378]: synchronized to 123.33.160.1, stratum 2
13 Aug 17:47:50 ntpd[11378]: time reset -0.898465 s
13 Aug 17:52:09 ntpd[11378]: synchronized to LOCAL(0), stratum 10



uwe




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