[Linuxptp-users] ptp4l and SHM?

[Gary E. M. <ge...@re...>]

Yo All!

About a year ago I was running tests feeding time from ptp4l to 
ntpd using a SHM.  I just repeated the experiment after updating
my linuxptp to git head, and now no luck.

My version:

# ptp4l -v
1.8-00063-g5ce04f9

I'm pretty much following the instructions here:

http://www.catb.org/gpsd/gpsd-time-service-howto.html#_providing_local_ntp_service_using_ptp

Here is my ptp.conf:

*********************
[global]
# only syslog every 1024 seconds
summary_interval 10

# send to to chronyd/ntpd using SHM 2
clock_servo ntpshm
ntpshm_segment 2

# set our priority high since we have PPS
priority1 10
priority2 10

[eth1]
*********************

I start the daemon this way:

# ptp4l -s -f /etc/ptp-howto.conf 

I have several masters setup similarly.  Serving local time.

My logs show that ptp4l has found a master:

Oct 27 12:22:02 spidey ptp4l[25614]: [3704655.074] tx_type   1 not 1
Oct 27 12:22:02 spidey ptp4l[25614]: [3704655.074] rx_filter 1 not 12
Oct 27 12:22:02 spidey ptp4l[25614]: [3704655.074] selected best master clock 0cc47a.fffe.72716b


But no new shm in /dev/shm.  My /dev/shm is world writeable, with the
sticky bit:

# ls -ld /dev/shm
drwxrwxrwt 2 root root 40 Oct 27 12:26 /dev/shm


And ntpshmmon shows my GPS and PPS SHMs, but nothing on SHM 2:

 # ntpshmmon
ntpshmmon version 1
#      Name Seen@                Clock                Real                 L Prec
sample NTP1 1509132165.355194143 1509132165.000085726 1509132165.000000000 0 -30
sample NTP0 1509132165.700599465 1509132165.699807167 1509132165.703999996 0 -20
sample NTP1 1509132166.000999683 1509132166.000049468 1509132166.000000000 0 -30
sample NTP0 1509132166.721725714 1509132166.721308687 1509132166.703999996 0 -20

I thought this worked last year, I had not touched the config or startup
files.  What stupid thing did I do to make this not work?

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	ge...@re...  Tel:+1 541 382 8588

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