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Make use of several older machines here for testing and software development. As single-core they are not even officially supported - but still make excellent test beds...

Just had an instance with a new install of ClearOS 7.3 where one machine's clock would loose several seconds in each minute. The rate was too great for ntp to correct... So what clock-source is being used and what is available?

[root@pamela ~]# cat /sys/devices/system/clocksource/clocksource0/available_clocksource
tsc acpi_pm
[root@pamela ~]# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc

OK - let's change it...

[root@pamela ~]# echo acpi_pm > /sys/devices/system/clocksource/clocksource0/current_clocksource
[root@pamela ~]# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
acpi_pm

It now keeps excellent time. See http://pamela.sraellis.tk/frame-10-ntp.html

One should make a systemd entry so this happens at boot time - too much effort! A simple line in /etc/rc.d/rc.local, although frowned on, is all that's required...

Might just help someone...
Wednesday, March 15 2017, 12:29 AM
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