On Tue, Aug 09, 2016 at 11:35:02AM +0000, Jesuiter, Henry (ALC NetworX GmbH) 
wrote:
> There is one message I'm still not sure about, but may be you can explain it 
> shortly.
> If I get a port up (except it is already up if ptp4l starts), I get the 
> following message:
> ptp4l[294.884]: eth1: SO_SELECT_ERR_QUEUE: Protocol not available

That is just a warning.  If you upgrade your kernel, then you will get
more efficient transmit time stamp polling, and the warning goes away
too!

Thanks,
Richard

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