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| author | John Klug <john.klug@multitech.com> | 2017-02-01 15:20:39 -0600 |
|---|---|---|
| committer | John Klug <john.klug@multitech.com> | 2017-02-01 15:20:39 -0600 |
| commit | d6d4c4ac30128fa21040241370f1ece872593951 (patch) | |
| tree | 093bfcbb6fee1aae0da13003b5c99acca56bce4f | |
| parent | b22e0e723285d41617c1fea5b72828b4de0e6074 (diff) | |
| download | meta-mlinux-d6d4c4ac30128fa21040241370f1ece872593951.tar.gz meta-mlinux-d6d4c4ac30128fa21040241370f1ece872593951.tar.bz2 meta-mlinux-d6d4c4ac30128fa21040241370f1ece872593951.zip | |
Commentary for GPS and PPS servers in ntp.conf
| -rw-r--r-- | recipes-support/ntp/files/ntp.conf.patch | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/recipes-support/ntp/files/ntp.conf.patch b/recipes-support/ntp/files/ntp.conf.patch index dbb7fb8..2d0fdd8 100644 --- a/recipes-support/ntp/files/ntp.conf.patch +++ b/recipes-support/ntp/files/ntp.conf.patch @@ -1,7 +1,7 @@ diff -Naur old/ntp.conf new/ntp.conf ---- old/ntp.conf 2017-01-17 12:00:15.560426583 -0600 -+++ new/ntp.conf 2017-01-17 12:02:11.968426337 -0600 -@@ -1,16 +1,44 @@ +--- old/ntp.conf 2017-02-01 12:51:59.766760466 -0600 ++++ new/ntp.conf 2017-02-01 14:46:23.005239689 -0600 +@@ -1,16 +1,58 @@ -# This is the most basic ntp configuration file # The driftfile must remain in a place specific to this # machine - it records the machine specific clock error @@ -36,10 +36,24 @@ diff -Naur old/ntp.conf new/ntp.conf + +# GPS Serial data reference (NTP0) +# This sets the GPS 50 milliseconds slower than the PPS. ++# "true" says we don't trust the system clock. ++# If we are depending on the GPS for timing, ++# we don't want ntp to mark the GPS as a falseticker ++# because of a performance issue. ++# If the GPS is marked as a false ticker ++# due to a bad timestamp from the system ++# clock (possibly because the system was ++# too busy to process an interrupt), ++# the GPS will be ignored, and if we are ++# depending on the GPS for leap second, it ++# will not happen. +server 127.127.28.0 true +fudge 127.127.28.0 time1 0.050 refid GPS + +# GPS PPS reference (NTP2) ++# If we are depending on the PPS for timing, ++# we don't want ntp to mark the PPS as a falseticker ++# because of a performance issue. +server 127.127.28.2 prefer true +fudge 127.127.28.2 time1 0.000 refid PPS + |