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--- stratum1ntp [2019/07/24 16:28] – andrew
+++ stratum1ntp [2021/11/28 02:51] (current) – andrew
@@ Line 1: / Line 1: @@
 ====== Stratum 1 NTP Setup on Raspberry Pi ======
+== By: Bun-Bun & guppy ==
   * This guides uses Uputronics Raspberry Pi+ GPS Expansion Board and a rpi3 or newer
   * Setup rpi with latest Raspbian, enable ssh, etc...
@@ Line 5: / Line 7: @@
   * raspi-config #disable linux from trying to access console getty
     * 5 Interfacing Options
-    * P6 Serial -> Login Shell (no)
+    * P6 Serial -> Login Shell (no) -> Enable Hardware (yes)
   * vi /boot/config.txt
     * Add the following to the bottom
     * <code>enable_uart=1
+dtoverlay=pi3-disable-wifi
 dtoverlay=pi3-disable-bt #same with rpi4
 #dtoverlay=pi3-miniuart-bt #if you want software BT
@@ Line 34: / Line 37: @@
   * vi /etc/ntp.conf
     * Change servers as appropriate, stuff at the bottom is the gpsd and pps link
+    * Can have no servers and only use gps/pps as source, or have more than 1 other. Two sources (yourself and some other server) is bad.
     * <code>
 # Enable this if you want statistics to be logged.
@@ Line 47: / Line 51: @@
 #server ntp.your-provider.example
+#Can have no servers and only use gps/pps as source, or have more than 1 other. Two sources (yourself and some other server) is bad.
 #server tock.usask.ca
 #server ntp2.torix.ca
-server ntp.zaf.ca
+#server ntp.zaf.ca
 # Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
@@ Line 89: / Line 94: @@
 server 127.127.28.0 minpoll 4 maxpoll 4 iburst prefer
 fudge 127.127.28.0 time1 +0.105 flag1 1 refid GPSD stratum 1
-tos mindist 0.015 #something about ignoring a certain amount of jitter from shitty sources
+tos mindist 0.015 #something about accepting a certain amount of jitter from serial sources
 </code>
   * apt-get install gpsd gpsd-clients
@@ Line 109: / Line 114: @@
 # Other options you want to pass to gpsd
-GPSD_OPTIONS=-n""
+GPSD_OPTIONS="-n"
 </code>
   * {{ntpsetup.tar|gpsControl files and install.sh}} #for stationary mode (Credit to guppy for creating and Bun-Bun for correcting)
     * Download linked tar
+      * wget -O ntpsetup.tar http://wiki.sktechworks.ca/lib/exe/fetch.php?media=ntpsetup.tar
     * tar -xvf ntpsetup.tar
-    * cd ntpsetup.tar
+    * cd ntpsetup
     * ./install.sh
     * This copies the gpscontrol files and creates/enables its service. Also makes a gpsd requirement for ntp
   * Disable NTP from dhcp
-    * echo "" > /etc/dhcp/dhclient-exit-hooks.d/ntp
+    * <code>
-    * echo "" > /var/lib/ntp/ntp.conf.dhcp
+echo "" > /etc/dhcp/dhclient-exit-hooks.d/ntp
-    * chattr +i /etc/dhcp/dhclient-exit-hooks.d/ntp
+echo "" > /var/lib/ntp/ntp.conf.dhcp
-    * chattr +i /var/lib/ntp/ntp.conf.dhcp
+chattr +i /etc/dhcp/dhclient-exit-hooks.d/ntp
+chattr +i /var/lib/ntp/ntp.conf.dhcp
+</code>
   * reboot
   * gpsmon #also cgps -s
@@ Line 128: / Line 136: @@
     * http://www.unixwiz.net/techtips/raspberry-pi3-gps-time.html
     * https://ava.upuaut.net/?p=951
+====== Optimizations ======
+  * https://www.ntpsec.org/white-papers/stratum-1-microserver-howto/
+  * Add nohz=off to the end of the line in /boot/cmdline.txt
+  * configure system to run cpu full speed
+    * <code>apt -y install cpufrequtils
+echo 'GOVERNOR="performance"' > /etc/default/cpufrequtils
+systemctl restart cpufrequtils</code>
+  * Remove useless stuff
+    * <code>apt -y purge bluez triggerhappy wpasupplicant alsa-utils
+systemctl stop avahi-daemon
+systemctl disable avahi-daemon
+apt -y autoremove
+apt clean
+</code>
+  * Set serial to low latency
+    * <code>crontab -e
+@reboot setserial /dev/ttyAMA0 low_latency
+</code>

stratum1ntp.1563985701.txt.gz · Last modified: 2019/07/24 16:28 by andrew

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