Gary,
The config file for ptp4l was just as provided in my last note. There
wasn't much else to setup. Note that I had no success with any of the Intel
igb drivers under RHEL 6.5. Everything works nicely under RHEL 7.0 kernel
3.10. (Or CenOS 7, same thing for free). I turned off tickless kernel
addng "nohz=off" to /boot/grub2/grub.cfg:
linux16 /vmlinuz-3.10.0-123.20.1.el7.x86_64
root=/dev/mapper/vg_ptp-lv_root ro audit=1 nomodeset crashkernel=auto
vconsole.keymap=us rd.lvm.lv=vg_ptp/lv_swap crashkernel=auto
vconsole.font=latarcyrheb-sun16 rd.lvm.lv=vg_ptp/lv_root rhgb quiet
LANG=en_US.UTF-8 nohz=off
I disabled chrony, as I am serving NTP. 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.
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
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. 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".
Hope this helps,
Rich Schmidt
On Thu, Feb 26, 2015 at 3:23 PM, Gary E. Miller <g...@rellim.com> wrote:
> Yo Rich!
>
> On Thu, 26 Feb 2015 14:59:01 -0500
> Rich Schmidt <schmidt.r...@gmail.com> wrote:
>
> > I have been running phase stability tests of linuxptp-1.5 using
> > linreg servo on an Intel i350-T2 (HP ProLiant DL120G6 RHEL 7.0 kernel
> > 3.10) synchronizing to an FEI-Zyfer Gsync Time and Frequency
> > Processor.
>
> Can you provide the full configuration and setup? Plus your measurement
> procedure? My newbie results are many orders of magnitude worse.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
> g...@rellim.com Tel:+1(541)382-8588
>
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