Re: [Ptpd-announce] [Ptpd-devel] 802.3 (Ethernet) mode for clients and PCAP support added to the trunk...

[Wojciech O. <woj...@ow...>]

George, All,

I just submitted some minor fixes to the PCAP code - tested on Linux: RHEL6
and Ubuntu. Hybrid and unicast modes should be working OK with PCAP now [
only slave mode tested! ]

Naturally PCAP works fine on Linux. I don't think there is a more portable
solution in userspace.

Observations so far:

- accuracy improved by approx 5us straight away, precision improved as well
due to lower jitter
- unfortunately servo output will be a little jittery (short-term jitter in
smaller scale - "thicker" plots basically), reason being that pcap we're
back to microsecond timestamp resolution - not much can be done about it it
seems, even with the latest libpcap
- need to double check socket initialisation and handling when using pcap:
ptpd is currently bounding back ICMP unreachables in reaction to unicast
delay responses. Doesn't break anything on the slave side but shouldn't be
happening.

Regards
Wojciech


On 23 May 2013 19:43, George Neville-Neil <gn...@ne...> wrote:

> Howdy,
>
> As of revision 324 of the trunk of the PTPd tree I have added support for
> reading packets
> over pcap/bpf (this works on BSD based systems and is being testing on
> FreeBSD) which
> also allows us to work in 802.3 mode.  I have tested this mode with both a
> Symmetricom (S350)
> and a Meinberg m600.  Testing will continue before the release but this is
> the first
> cut of this code.  Please update your trees and test in your own
> evnironments and report
> bugs.  If someone could look at replicating the pcap/bpf work on top of
> whatever similar
> feature Linux provides that would be most welcome.
>
> Best,
> George
>
>
>
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-- 
-

Wojciech Owczarek