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The [option]`-a` option causes [application]*phc2sys* to read the clocks to be synchronized from the [application]*ptp4l* application. If you want the system clock to be eligible to become a time source, specify the [option]`-r` option twice.
Alternately, use the [option]`-s` option to synchronize the system clock to a specific interface's `PTP` hardware clock. For example:
~]#{nbsp}phc2sys -s em3 -w
The [option]`-w` option waits for the running [application]*ptp4l* application to synchronize the `PTP` clock and then retrieves the *TAI* to *UTC* offset from [application]*ptp4l*.
Normally, `PTP` operates in the _International Atomic Time_ (*TAI*) timescale, while the system clock is kept in _Coordinated Universal Time_ (*UTC*). The current offset between the TAI and UTC timescales is 35 seconds. The offset changes when leap seconds are inserted or deleted, which typically happens every few years. The [option]`-O` option needs to be used to set this offset manually when the [option]`-w` is not used, as follows:
~]#{nbsp}phc2sys -s em3 -O -35
Once the [application]*phc2sys* servo is in a locked state, the clock will not be stepped, unless the [option]`-S` option is used. This means that the [application]*phc2sys* program should be started after the [application]*ptp4l* program has synchronized the `PTP` hardware clock. However, with [option]`-w`, it is not necessary to start [application]*phc2sys* after [application]*ptp4l* as it will wait for it to synchronize the clock.
The [application]*phc2sys* program can also be started as a service by running:
~]#{nbsp}systemctl start phc2sys
When running as a service, options are specified in the `/etc/sysconfig/phc2sys` file. More information on the different [application]*phc2sys* options can be found in the `phc2sys(8)` man page.
Note that the examples in this section assume the command is run on a slave system or slave port.
Verifying Time Synchronization
When `PTP` time synchronization is working properly, new messages with offsets and frequency adjustments will be printed periodically to the [application]*ptp4l* and [application]*phc2sys* (if hardware time stamping is used) outputs. These values will eventually converge after a short period of time. These messages can be seen in `/var/log/messages` file. An example of the output follows:
ptp4l[352.359]: selected /dev/ptp0 as PTP clock
ptp4l[352.361]: port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l[352.361]: port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l[353.210]: port 1: new foreign master 00a069.fffe.0b552d-1
ptp4l[357.214]: selected best master clock 00a069.fffe.0b552d
ptp4l[357.214]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[359.224]: master offset 3304 s0 freq +0 path delay 9202
ptp4l[360.224]: master offset 3708 s1 freq -29492 path delay 9202
ptp4l[361.224]: master offset -3145 s2 freq -32637 path delay 9202
ptp4l[361.224]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[362.223]: master offset -145 s2 freq -30580 path delay 9202
ptp4l[363.223]: master offset 1043 s2 freq -29436 path delay 8972
ptp4l[364.223]: master offset 266 s2 freq -29900 path delay 9153
ptp4l[365.223]: master offset 430 s2 freq -29656 path delay 9153
ptp4l[366.223]: master offset 615 s2 freq -29342 path delay 9169
ptp4l[367.222]: master offset -191 s2 freq -29964 path delay 9169
ptp4l[368.223]: master offset 466 s2 freq -29364 path delay 9170
ptp4l[369.235]: master offset 24 s2 freq -29666 path delay 9196
ptp4l[370.235]: master offset -375 s2 freq -30058 path delay 9238
ptp4l[371.235]: master offset 285 s2 freq -29511 path delay 9199
ptp4l[372.235]: master offset -78 s2 freq -29788 path delay 9204
An example of the [application]*phc2sys* output follows:
phc2sys[526.527]: Waiting for ptp4l...
phc2sys[527.528]: Waiting for ptp4l...
phc2sys[528.528]: phc offset 55341 s0 freq +0 delay 2729
phc2sys[529.528]: phc offset 54658 s1 freq -37690 delay 2725
phc2sys[530.528]: phc offset 888 s2 freq -36802 delay 2756
phc2sys[531.528]: phc offset 1156 s2 freq -36268 delay 2766
phc2sys[532.528]: phc offset 411 s2 freq -36666 delay 2738
phc2sys[533.528]: phc offset -73 s2 freq -37026 delay 2764
phc2sys[534.528]: phc offset 39 s2 freq -36936 delay 2746
phc2sys[535.529]: phc offset 95 s2 freq -36869 delay 2733
phc2sys[536.529]: phc offset -359 s2 freq -37294 delay 2738
phc2sys[537.529]: phc offset -257 s2 freq -37300 delay 2753
phc2sys[538.529]: phc offset 119 s2 freq -37001 delay 2745
phc2sys[539.529]: phc offset 288 s2 freq -36796 delay 2766
phc2sys[540.529]: phc offset -149 s2 freq -37147 delay 2760
phc2sys[541.529]: phc offset -352 s2 freq -37395 delay 2771
phc2sys[542.529]: phc offset 166 s2 freq -36982 delay 2748
phc2sys[543.529]: phc offset 50 s2 freq -37048 delay 2756
phc2sys[544.530]: phc offset -31 s2 freq -37114 delay 2748
phc2sys[545.530]: phc offset -333 s2 freq -37426 delay 2747
phc2sys[546.530]: phc offset 194 s2 freq -36999 delay 2749
For [application]*ptp4l* there is also a directive, [option]`summary_interval`, to reduce the output and print only statistics, as normally it will print a message every second or so. For example, to reduce the output to every `1024` seconds, add the following line to the `/etc/ptp4l.conf` file:
summary_interval 10
An example of the [application]*ptp4l* output, with [option]`summary_interval 6`, follows:
ptp4l: [615.253] selected /dev/ptp0 as PTP clock
ptp4l: [615.255] port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l: [615.255] port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l: [615.564] port 1: new foreign master 00a069.fffe.0b552d-1
ptp4l: [619.574] selected best master clock 00a069.fffe.0b552d
ptp4l: [619.574] port 1: LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l: [623.573] port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l: [684.649] rms 669 max 3691 freq -29383 ± 3735 delay 9232 ± 122
ptp4l: [748.724] rms 253 max 588 freq -29787 ± 221 delay 9219 ± 158
ptp4l: [812.793] rms 287 max 673 freq -29802 ± 248 delay 9211 ± 183
ptp4l: [876.853] rms 226 max 534 freq -29795 ± 197 delay 9221 ± 138
ptp4l: [940.925] rms 250 max 562 freq -29801 ± 218 delay 9199 ± 148
ptp4l: [1004.988] rms 226 max 525 freq -29802 ± 196 delay 9228 ± 143
ptp4l: [1069.065] rms 300 max 646 freq -29802 ± 259 delay 9214 ± 176
ptp4l: [1133.125] rms 226 max 505 freq -29792 ± 197 delay 9225 ± 159
ptp4l: [1197.185] rms 244 max 688 freq -29790 ± 211 delay 9201 ± 162
To reduce the output from the [application]*phc2sys*, it can be called it with the [option]`-u` option as follows:
~]#{nbsp}phc2sys -u summary-updates
Where _summary-updates_ is the number of clock updates to include in summary statistics. An example follows:
~]#{nbsp}phc2sys -s em3 -w -m -u 60
phc2sys[700.948]: rms 1837 max 10123 freq -36474 ± 4752 delay 2752 ± 16
phc2sys[760.954]: rms 194 max 457 freq -37084 ± 174 delay 2753 ± 12
phc2sys[820.963]: rms 211 max 487 freq -37085 ± 185 delay 2750 ± 19
phc2sys[880.968]: rms 183 max 440 freq -37102 ± 164 delay 2734 ± 91
phc2sys[940.973]: rms 244 max 584 freq -37095 ± 216 delay 2748 ± 16
phc2sys[1000.979]: rms 220 max 573 freq -36666 ± 182 delay 2747 ± 43
phc2sys[1060.984]: rms 266 max 675 freq -36759 ± 234 delay 2753 ± 17
Serving PTP Time with NTP
The `ntpd` daemon can be configured to distribute the time from the system clock synchronized by [application]*ptp4l* or [application]*phc2sys* by using the LOCAL reference clock driver. To prevent `ntpd` from adjusting the system clock, the `ntp.conf` file must not specify any `NTP` servers. The following is a minimal example of `ntp.conf`:
~]#{nbsp}cat /etc/ntp.conf
server 127.127.1.0
fudge 127.127.1.0 stratum 0
When the `DHCP` client program, [application]*dhclient*, receives a list of `NTP` servers from the `DHCP` server, it adds them to `ntp.conf` and restarts the service. To disable that feature, add [command]#PEERNTP=no# to `/etc/sysconfig/network`.
Serving NTP Time with PTP
`NTP` to `PTP` synchronization in the opposite direction is also possible. When `ntpd` is used to synchronize the system clock, [application]*ptp4l* can be configured with the [option]`priority1` option (or other clock options included in the best master clock algorithm) to be the grandmaster clock and distribute the time from the system clock via `PTP`:
~]#{nbsp}cat /etc/ptp4l.conf
[global]
priority1 127
[em3]
# ptp4l -f /etc/ptp4l.conf

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phc2sys[526.527]: Waiting for ptp4l...
phc2sys[527.528]: Waiting for ptp4l...
phc2sys[528.528]: phc offset 55341 s0 freq +0 delay 2729
phc2sys[529.528]: phc offset 54658 s1 freq -37690 delay 2725
phc2sys[530.528]: phc offset 888 s2 freq -36802 delay 2756
phc2sys[531.528]: phc offset 1156 s2 freq -36268 delay 2766
phc2sys[532.528]: phc offset 411 s2 freq -36666 delay 2738
phc2sys[533.528]: phc offset -73 s2 freq -37026 delay 2764
phc2sys[534.528]: phc offset 39 s2 freq -36936 delay 2746
phc2sys[535.529]: phc offset 95 s2 freq -36869 delay 2733
phc2sys[536.529]: phc offset -359 s2 freq -37294 delay 2738
phc2sys[537.529]: phc offset -257 s2 freq -37300 delay 2753
phc2sys[538.529]: phc offset 119 s2 freq -37001 delay 2745
phc2sys[539.529]: phc offset 288 s2 freq -36796 delay 2766
phc2sys[540.529]: phc offset -149 s2 freq -37147 delay 2760
phc2sys[541.529]: phc offset -352 s2 freq -37395 delay 2771
phc2sys[542.529]: phc offset 166 s2 freq -36982 delay 2748
phc2sys[543.529]: phc offset 50 s2 freq -37048 delay 2756
phc2sys[544.530]: phc offset -31 s2 freq -37114 delay 2748
phc2sys[545.530]: phc offset -333 s2 freq -37426 delay 2747
phc2sys[546.530]: phc offset 194 s2 freq -36999 delay 2749
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Source string description
type: delimited block -
Flags
no-wrap, read-only
Source string location
./pages/servers/Configuring_PTP_Using_ptp4l.adoc:375
String age
4 years ago
Last updated
a year ago
Source string age
4 years ago
Translation file
pot/f26/pages/servers/Configuring_PTP_Using_ptp4l.pot, string 105