Another strange bit is without PTP or any other time protocol running, on many
of the systems the system clock is drifting rapidly after syncing it to
hardware clock manually. Within twenty minutes the system clock is 7 minutes
ahead of the hardware clock. Is there way to see what is affecting the system
clock? There are about 8 machines acting this way, another 3 with seemingly the
same hardware, OS, and software on the same switch that are not exhibiting the
behavior.
The following is 24 hours after syncing the System clock to the hardware clock
manually
date;hwclock
Thu Apr 20 18:58:01 CDT 2017
Thu 20 Apr 2017 04:38:20 PM CDT -0.310003 seconds
ethtool -i ens2
driver: mlx4_en
version: 3.1-1.0.4 (30 Sep 2015)
firmware-version: 2.35.5100
bus-info: 0000:83:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: yes
ethtool -T ens2
Time stamping parameters for ens2:
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)
-----Original Message-----
From: Richard Cochran [mailto:[email protected]]
Sent: Thursday, April 20, 2017 5:23 PM
To: Collins, Cris L.
Cc: [email protected]
Subject: Re: [Linuxptp-users] High frequency
On Wed, Apr 19, 2017 at 06:52:41PM +0000, Collins, Cris L. wrote:
> We have a dozen very similar RHEL 7.2 systems configured with Linuxptp 1.6
> and the same NIC driver version on each. Some of them look great, some show a
> frequency of "-100000000" and an offset of ~ -2333333 and some say
> Clockcheck: clock jumped forward or running faster than expected. Everyone is
> on the same switch.
Sounds like a HW bug.
> What are some things we can do to debug the problem machines?
Which HW are you using?
Thanks,
Richard
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