netdev - Re: [PATCH net-next] dp83640: Adjust ptp event timestamps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140710173439.GB7965@localhost.localdomain>
Date:	Thu, 10 Jul 2014 19:34:39 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Sørensen, Stefan 
	<Stefan.Sorensen@...ctralink.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] dp83640: Adjust ptp event timestamps

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



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html