From: Richard Cochran <richardcochran@gmail.com>
To: "Sørensen, Stefan" <Stefan.Sorensen@spectralink.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next] dp83640: Adjust ptp event timestamps
Date: Thu, 10 Jul 2014 19:34:39 +0200 [thread overview]
Message-ID: <20140710173439.GB7965@localhost.localdomain> (raw)
In-Reply-To: <1404983629.2901.8.camel@e37108.spectralink.com>
On Thu, Jul 10, 2014 at 09:13:51AM +0000, Sørensen, Stefan wrote:
> This is not adjusting the packet timestamps but the gpio event
> timestamps - the ptp protocol is not involved here. Without this
> adjustment, looping back a pps signal from one gpio to another will
> result in a ~35ns offset.
Oops, sorry.
> Then the end user will have to figure out what delay corrections need to
> be made and configure the applications(s) to adjust for this. But I
> don't see any good solution to this either.
Yep, not so easy. I think it is only practical in a highly controlled
environment.
Thanks,
Richard
next prev parent reply other threads:[~2014-07-10 17:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 10:22 [PATCH net-next] dp83640: Adjust ptp event timestamps Stefan Sørensen
2014-07-09 17:41 ` Richard Cochran
2014-07-10 9:13 ` Sørensen, Stefan
2014-07-10 17:34 ` Richard Cochran [this message]
2014-07-10 17:35 ` Richard Cochran
2014-07-10 17:38 ` Richard Cochran
-- strict thread matches above, loose matches on Subject: below --
2014-07-11 6:18 Stefan Sørensen
2014-07-11 21:05 ` David Miller
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