Hi, I am having a Centos server that is a PTP grandmaster for systems in my network. The server is getting the time using NTP (chrony) from interface eth0 and acts as a PTP grandmaster on interface eth1. The requirement is that the server and other systems on eth1 network are in sync (phc and sys time). I am using ptp4l for PTP syncronization and phc2sys to sync clocks. The problem is that the sys time and phc time on the server are drifting apart by around 70ms per hour. I am setting the phc to UTC with 37 seconds offset after boot: testptp -s testptp -t 37 PTP and phc2sys options are as follows: ptp4l -f /etc/ptp4l.conf -i eth1 phc2sys -a -r -r
Would anybody have a suggestion on how to keep the phc and sys time in sync on the server? I would appreciate any help. The chronyd and ptp4l config files are provided below. Thanks. /Joanna ptp4l.conf [global] # # Default Data Set # twoStepFlag 1 slaveOnly 0 priority1 128 priority2 128 domainNumber 0 #utc_offset 37 clockClass 248 clockAccuracy 0xFE offsetScaledLogVariance 0xFFFF free_running 0 freq_est_interval 1 dscp_event 0 dscp_general 0 # # Port Data Set # logAnnounceInterval 1 logSyncInterval 0 logMinDelayReqInterval 0 logMinPdelayReqInterval 0 announceReceiptTimeout 3 syncReceiptTimeout 0 delayAsymmetry 0 fault_reset_interval 4 neighborPropDelayThresh 20000000 # # Run time options # assume_two_step 0 logging_level 6 path_trace_enabled 0 follow_up_info 0 hybrid_e2e 0 tx_timestamp_timeout 500 use_syslog 1 verbose 0 summary_interval 0 kernel_leap 1 check_fup_sync 0 # # Servo Options # pi_proportional_const 0.0 pi_integral_const 0.0 pi_proportional_scale 0.0 pi_proportional_exponent -0.3 pi_proportional_norm_max 0.7 pi_integral_scale 0.0 pi_integral_exponent 0.4 pi_integral_norm_max 0.3 step_threshold 0.0 first_step_threshold 0.00002 max_frequency 900000000 clock_servo pi sanity_freq_limit 200000000 ntpshm_segment 0 # # Transport options # transportSpecific 0x0 ptp_dst_mac 01:1B:19:00:00:00 p2p_dst_mac 01:80:C2:00:00:0E udp_ttl 1 udp6_scope 0x0E uds_address /var/run/ptp4l # # Default interface options # network_transport UDPv4 delay_mechanism E2E time_stamping hardware tsproc_mode filter delay_filter moving_median delay_filter_length 10 egressLatency 0 ingressLatency 0 boundary_clock_jbod 0 # # Clock description # productDescription ;; revisionData ;; manufacturerIdentity 00:00:00 userDescription ; timeSource 0xA0 chrony.conf # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). server 0.centos.pool.ntp.org iburst server 1.centos.pool.ntp.org iburst server 2.centos.pool.ntp.org iburst server 3.centos.pool.ntp.org iburst # Record the rate at which the system clock gains/losses time. driftfile /var/lib/chrony/drift # Allow the system clock to be stepped in the first three updates # if its offset is larger than 1 second. makestep 1.0 3 # Enable kernel synchronization of the real-time clock (RTC). rtcsync _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
