commit ec56e678203dbc77cbf7f3662bdb1dda2b5d8b30
Author: Stephen Wadeley <swadeley(a)redhat.com>
Date: Mon Oct 14 21:24:31 2013 +0200
Updates to Configuring PTP using ptp4l | based on SME feedback
thank you mlichvar
en-US/Configuring_PTP_using_ptp4l.xml | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletions(-)
---
diff --git a/en-US/Configuring_PTP_using_ptp4l.xml
b/en-US/Configuring_PTP_using_ptp4l.xml
index 22b64dc..74dddcc 100644
--- a/en-US/Configuring_PTP_using_ptp4l.xml
+++ b/en-US/Configuring_PTP_using_ptp4l.xml
@@ -129,6 +129,9 @@ should include:
<screen>~]# <command>yum install linuxptp</command></screen>
This will install <application>ptp4l</application> and
<application>phc2sys</application>.
</para>
+ <para>
+ Do not run another service to set the system clocktime at the same time. If you
intened to serve <systemitem class="protocol">PTP</systemitem> time
using <systemitem class="protocol">NTP</systemitem>, see <xref
linkend="Serving_PTP_time_with_NTP" />.
+ </para>
</section>
<section id="Starting_ptp4l">
@@ -314,7 +317,11 @@ The <application>phc2sys</application> program can be
also started as a service
<screen>~]# <command>systemctl start phc2sys</command></screen>
When running as a service, options are specified in the
<filename>/etc/sysconfig/phc2sys</filename> file. More information on the
different <application>phc2sys</application> options can be found in the
<filename>phc2sys(8)</filename> man page.
</para>
- </section>
+ <para>
+ Note that the examples in this section assume the command is run on a slave system or
slave port.
+ </para>
+</section>
+
<section id="Verifying_time_synchronization">
<title>Verifying time synchronization</title>
<para>
@@ -347,6 +354,11 @@ master offset 632 s2 adj -28113 path delay 12443
server 127.127.1.0
fudge 127.127.1.0 stratum 0</screen>
</para>
+ <note>
+ <para>
+ When the <systemitem class="protocol">DHCP</systemitem>
client program, <application>dhclient</application>, receives a list of
<systemitem class="protocol">NTP</systemitem> servers from the
<systemitem class="protocol">DHCP</systemitem> server, it adds them
to <filename>ntp.conf</filename> and restarts the service. To disable that
feature, add <command>PEERNTP=no</command> to
<filename>/etc/sysconfig/network</filename>.
+ </para>
+ </note>
</section>
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