Yo Rich! On Thu, 26 Feb 2015 16:29:00 -0500 Rich Schmidt <schmidt.r...@gmail.com> wrote:
> The config file for ptp4l was just as provided in my last note. There > wasn't much else to setup. Uh, sorry, already deleted... > I disabled chrony, as I am serving NTP. Uh, say what? Chronyd is used to serve NTP, I hope you are not using ntpd instead? I find chrony much superior in timeserving to chronyd. > I have an FEI-Zyfer Gsync II > Time and Frequency Processor acting as PTP Grandmaster. I configured > the IP address of an i350 NIC to the same subnet as my Grandmaster. > Using "ethtool -T" I find that my PHC is number 0, which is /dev/ptp0. Could I please get the ethtool -T dump? I'm trying to figure out what features do what... > So my ptp4l command is: > nohup nice --20 /usr/local/sbin/ptp4l -m -f /etc/ptp4l.conf -i eth2 -p > /dev/ptp0 > /var/log/ptp4l.log & > and to steer my system to the PHC I run: > nohup nice --20 /usr/local/sbin/phc2sys -q -m -c CLOCK_REALTIME -s > /dev/ptp0 -E linreg -O 0 -l 7 >/var/log/ptp/phc2sys.log & > > Note that my Grandmaster is on UTC , not PTP timescale, so I specify > -O 0 for the UTC offset for phc2sys. > Then I run as an NTP stratum 1 server using the local clock refclock > in /etc/ntp.conf: > server 127.127.1.0 prefer > server 192.5.41.40 noselect > fudge 127.127.1.0 stratum 0 > fudge 127.127.1.0 refid PTP Hmm, no secondary sources? How do you know you do not have the large offset I see? > Not everyone has an FEI-Zyfer Gsync for a grandmaster. At home I have > two Supermicro Atom servers, one is grandmaster, one is slave. The > grandmaster has a GPS receiver outputting 1PPS which is connected to > the DCD pin on the internal COM2 serial header. Here the NTP > refclock_nmea driver synchronizes the system clock of the > grandmaster. Then 'phc2sys -s CLOCK_REALTIME -c /dev/ptp0" steers the > PHC to system time, while ptp4l provides PTP on an Intel i210 NIC. And who is sending SHM 0? And how? > On the slave Supermicro server a second Intel i210 NIC synchronizes > to the grandmaster as above. For complete details google "Developing > Low-Cost NTP Stratum 1 Servers with Linux PTP and GPS". This one? http://www.academia.edu/10312557/DEVELOPING_LOW-COST_NTP_STRATUM_1_SERVERS_WITH_LINUX_PTP_AND_GPS Sadly, after jumping through several hoops, it would not let me get to the paper (eventual 404). Got a better URL? RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701 g...@rellim.com Tel:+1(541)382-8588 ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
