Re: ntp sanity limit kills ntp daily

From: Bill Davidsen (davidsen_at_deathstar.prodigy.com)
Date: 05/23/05 

Date: Mon, 23 May 2005 16:35:31 GMT

Michael Ward wrote:
> Hello All,
>
> I've configured my FC3 system to run ntp successfully at boot time and
> ntp seems to run successfully for about a day. However, every night the
> clock looses some 1200 seconds while the system is busy making backups.
> When ntp figures this out, it refuses to update the clock because this
> is classified as insane, and terminates.
>
> I happen to agree that the clock loosing about 1200 seconds (for any
> reason) seems insane. However, given that this sort of behavior seems
> common enough to be found via google (search for: ntp exceeds sanity
> limit), I'm hopeful that there is a way to coax ntp (or some other
> automated program) to trudge on and do the deed anyway.
>
> Default rules can make is seem like a crazy world, can't they?
>
> I'm running a self compiled linux kernel 2.6.9 with FC3 linux as
> installed from Negus' "Red Hat Fedora Linux 3". Anyoune out there know
> how to make this sort of thing work in a rational manner?

Look for a device not using DMA, or not allowing interrupts while i/o is
in progress. If you back up to CD/DVD in pio mode you risk loss of time
and data integrety (have you checked you backups?) doing that. Check
/proc/irq and see if you have a lot of shared irq's, or have you diddles
acpi (or should you?).

Just some of the things you can think about, may well be "none of the
above." 

-- 
bill davidsen
   SBC/Prodigy Yorktown Heights NY data center
   http://newsgroups.news.prodigy.com

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