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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Accurately measuring clock drift
- From: "Kevin P. Fleming" <lists.chrony-users@xxxxxxxxxxxxx>
- Date: Wed, 21 Jun 2023 07:31:29 -0400
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On Wed, Jun 21, 2023, at 07:17, Rob Janssen wrote:
> Miroslav,
>
> Are you aware of any affordable PCIe card that supports PPS input on a
> generic PC server?
>
> Ideally would be like this:
>
> - TTL input of a PPS signal with minimal pulse length all the way down to 100ns
> - some hardware time stamping method
> - supported interface to chrony
That's going to be the tricky bit... Chrony does not talk to hardware directly, it relies on interfaces provided by the kernel, so any interface of this type would need to conform to some existing kernel interface, or the supplier would need to provide a driver for the user to compile/install.
At this point it seems the industry has moved towards doing this over Ethernet, using PTP, so in this 'ideal world' your GPSDO would have an Ethernet connection and provide a PTP source.
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