| Re: [chrony-dev] SW/HW timestamping on Linux |
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- To: chrony-dev@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-dev] SW/HW timestamping on Linux
- From: Denny Page <dennypage@xxxxxx>
- Date: Wed, 14 Dec 2016 22:31:01 -0800
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Interesting! I would not have thought of this. Both the i211 and i354 have the SDP pins. Not exactly a pre-made PPS input, but possible with some soldering and some code.
Denny
> On Dec 13, 2016, at 23:21, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
>
> On Tue, Dec 13, 2016 at 05:03:15PM -0800, Denny Page wrote:
>> Unfortunately, I’ve not yet received any response on the Intel list. While it’s quite clear that both the i211 and i354 require some compensation, I don’t have a good way to determine it other than by shots in the dark. The i211 seems to correspond with the i210 correction parameters, so I am currently using those for the i210, but the i354 is completely different. Still at it.
>
> Do you know if the i211 or i354 has a PPS input? i210 does have one
> [1]. I have not had a chance to try it yet. If you could connect it to
> the LeoNTP unit, maybe you could measure the difference between errors
> in TX and RX timestamping, and with direct connection to the server
> maybe even estimate the absolute value of the TX/RX corrections.
>
> [1] https://sourceforge.net/p/linuxptp/mailman/message/34782351/
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