fedora-docs-l10n/fedora-system-administrat/f37/pages/servers/Configuring_PTP_Using_ptp4l — English @ Fedora Weblate: phc2sys[526.527]: Waiting for ptp4l... phc2sys[527.528]: Waiting for ptp4l... phc2sys[528.528]: phc …

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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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	English	Actions
	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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English

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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./pages/servers/Configuring_PTP_Using_ptp4l.adoc:375

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pot/f37/pages/servers/Configuring_PTP_Using_ptp4l.pot, string 105

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