[ntp:questions] [LinuxPPS] Allan deviation survey

Miroslav Lichvar mlichvar at redhat.com
Fri Sep 10 13:26:52 UTC 2010


On Fri, Sep 10, 2010 at 03:11:14PM +0200, Udo van den Heuvel wrote:
> On 2010-09-10 15:04, Miroslav Lichvar wrote:
> > If you have a PPS device and would be willing to run the machine
> > unsynchronized for a day, I'd like to ask you to measure the Allan
> > deviation and send it to me.
> 
> Interesting tool, but pity that we cannot run ntpd together with this
> survey tool.
> Can't we think of a workaround for this issue?

Hm, I think it would have to know when exactly and how much was kernel
PLL frequency and offset changed to undo the corrections. This would
require patching the kernel to make the information available.

-- 
Miroslav Lichvar



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