Re: [Linuxptp-users] Video driver messing with PTP

[Matthew H. <mh...@ox...>]

Is it possible that you have the Nvidia native driver loaded on the machine? If I remember, the native driver won't load if nouveau is running, so it might be running now.

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From: Collins, Cris L. [mailto:Cri...@gd...]
Sent: Wednesday, January 18, 2017 6:17 PM
To: lin...@li...
Subject: [Linuxptp-users] Video driver messing with PTP

Can someone tell me why blacklisting a video driver, in this case nouveau,  in CentOS 7.2 would cause the following:

Jan 18 17:52:20 ho3 ptp4l: [215.091] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:20 ho3 ptp4l: [215.202] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:20 ho3 ptp4l: [215.393] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:20 ho3 ptp4l: [215.555] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:20 ho3 ptp4l: [215.832] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:20 ho3 ptp4l: [216.043] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:21 ho3 ptp4l: [216.207] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:21 ho3 ptp4l: [216.374] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:21 ho3 ptp4l: [216.639] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:21 ho3 ptp4l: [216.995] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:22 ho3 ptp4l: [217.113] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:22 ho3 ptp4l: [217.250] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:22 ho3 ptp4l: [217.388] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:22 ho3 ptp4l: [217.513] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:22 ho3 ptp4l: [217.745] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:22 ho3 ptp4l: [217.923] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [218.250] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [218.370] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [218.524] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [218.626] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [218.798] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [218.907] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:23 ho3 ptp4l: [219.014] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:24 ho3 ptp4l: [219.250] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:24 ho3 ptp4l: [219.412] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:24 ho3 ptp4l: [219.524] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:24 ho3 ptp4l: [219.752] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:24 ho3 ptp4l: [219.855] clockcheck: clock jumped forward or running faster than expected!
Jan 18 17:52:24 ho3 ptp4l: [219.981] clockcheck: clock jumped forward or running faster than expected!

"date" shows a time very close to that being output by the PTP server. With video driver loaded all is well. Any troubleshooting advice?  There are problems with nouveau driver that I suspect are crashing the system, so I would like to turn it off to confirm, but need PTP running.

ethtool -T ens6
Time stamping parameters for ens6:
Capabilities:
        hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)
        software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)
        hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)
        software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)
        software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
        hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 2
Hardware Transmit Timestamp Modes:
        off                   (HWTSTAMP_TX_OFF)
        on                    (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
        none                  (HWTSTAMP_FILTER_NONE)
        all                   (HWTSTAMP_FILTER_ALL)

ethtool -i ens6
driver: mlx4_en
version: 3.1-1.0.4 (30 Sep 2015)
firmware-version: 2.36.5120
bus-info: 0000:83:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: yes

Thank you for any pointers that you may provide.