[Linuxptp-users] running ptp4l under vmware

[Brooks, J. <Jas...@Al...>]

Hello,

I am trying to build a proof-of-concept systems that will listen for ptp and then serve ntp, but I seem to have a problem: the clock on the system does not seem to get set by ptp, and therefore the clock drifts.  I have a test system that uses multiple internet ntp sources and this one: this one's offset keeps growing.

I don't see any sign in /var/log/messages that the clock is trying to be slewed or stepped.

This is a centos 7 system running under vmware 6.7 (no precision clock available).  It is using the ethernet device "e1000" to allow the ethernet software timestamping for both transmit and receive.  There is no /dev/ptp device so phc2sys is not running.

There are two grandmaster ptp feeds coming into this system.

Upgrading to vmware 7 is not in the cards at the moment, but I might get to play with sr-iov.

I am running ptp4l as: "/usr/sbin/ptp4l -f /etc/ptp4l.conf -i ens34 -l 5 -S"

Ptp4l is configured with the following values altered in the /etc/ptp4l.conf:
               domainNumber == 44
               slaveOnly             == 1

ntpd is running with a minimal config:
server 127.127.1.0
fudge 127.127.1.0 stratum 0

pmc "GET time_status_np" shows that ptp4l is synced with the grand master
sending: GET TIME_STATUS_NP
        005056.fffe.be1c0f-0 seq 0 RESPONSE MANAGEMENT TIME_STATUS_NP
                master_offset              0
                ingress_time               1636054977549001043
                cumulativeScaledRateOffset +0.000000000
                scaledLastGmPhaseChange    0
                gmTimeBaseIndicator        0
                lastGmPhaseChange          0x0000'0000000000000000.0000
                gmPresent                  true
                gmIdentity                 0080ea.fffe.842b60

pmc -u -b 0 -f /etc/ptp4l.conf "GET current_data_set"
sending: GET CURRENT_DATA_SET
       005056.fffe.be1c0f-0 seq 0 RESPONSE MANAGEMENT CURRENT_DATA_SET
                stepsRemoved     1
                offsetFromMaster 0.0
                meanPathDelay    0.0








Jason Brooks
Senior Cloud Infrastructure Engineer
Infrastructure and Engineering Services
Allstream

[id:image001.jpg@01D2AD47.F9210620]<http://www.allstream.com/>


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