Yo Miroslav!
On Fri, 27 Feb 2015 07:48:09 +0100
Miroslav Lichvar <mlich...@redhat.com> wrote:
> > > One other tidbit is that I210 supports EEE, which can affect
> > > jitter, although I wouldn't expect it on that level. You can try
> > > turning this off via ethtool (ethtool --set-eee ethX eee off) to
> > > see if that helps.
> >
> > I'll try that next week. But my problem is offset. Plus chronyd
> > doing somthing wrong as no way there is 1000 nSec jitter, I can see
> > the offset jumping around!
>
> The default precision of the SHM refclock in chrony is 1 microsecond,
> it won't report jitter smaller than that. Add "precision 1e-9" to the
> SHM line in your chrony.conf to fix that.
Ah, that explains a lot. Will that fix the jitter computation?
> Ideally chronyd would be using
> the value from the SHM samples, but some clients didn't set this
> correctly, so it is currently ignored.
Easy to handle. ntpd sets the precision to -20 when it opens the
shm. If the client never updates the precision that is now OK. If
the client does update the precision even better.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
g...@rellim.com Tel:+1(541)382-8588
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