Yo Gary!
On Mon, 2 Mar 2015 15:39:23 -0800
"Gary E. Miller" <g...@rellim.com> wrote:
> On Thu, 26 Feb 2015 21:16:21 +0000
> "Vick, Matthew" <matthew.v...@intel.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.
>
> Ding-ding-ding, I think we might have a winner. That instantly
> dropped my offset from -400 mSec to around 1 mSec. That 1 mSec is
> well within the confusion that the ntpd PLLs just took. Jitter went
> to 1 uSec. Time to hook the PPS back up and get serious.
I hooked my PPS back up, let things settle. Checked 'chronyc sources'
some more. My hardware timestamp jitter is now down to around a
uSec. But I still have a (smaller) persistent offset. Now seems to
be running around 80 mSec.
My master and slave have similar PPS clocks, so the offset from PPS
to timestamp hardware is very real.
But, real progress, so I'll try an 82574L on another host. Sadly the
82574L does not support EEE, so that will not help.
RGDS
GARY
---------------------------------------------------------------------------
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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