#8759: Fix clocksource for ntp
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Reporter: ken@… | Owner: blfs-book@…
Type: enhancement | Status: new
Priority: normal | Milestone: 8.0
Component: BOOK | Version: SVN
Severity: normal | Keywords:
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One one of my machines I had to manipulate the system date/time to ensure
that PDFs of different versions of a TTF font (produced by 'fret' which
includes the date and time in the heading) matched.
That caused me to looked at my syslog, and I discovered that not
everything was rosy.
I saw several messages like
{{{
frequency error 1726 PPM exceeds tolerance 500 PPM
}}}
although these had not previously been apparent, and something in the
current kernel (after a lot of software suspends and wakens) maybe dropped
the ball. However, the box was no longer synchronising.
This is apparently fixable by:
1. Check the available clock sources in cat
/sys/devices/system/clocksource/clocksource0/available_clocksource
2. The default is now tsc, it used (years ago!) to be acpi_pm. Assuming
acpi_pm is available, echo that to
/sys/devices/system/clocksource/clocksource0/current_clocksource
3. If things improve, add that as a boot option in grub, i.e.
clocksource=acpi_pm
At the moment I've been running with acpi_pm for a bit over a day, but I
haven't rebooted to force it from grub.
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Ticket URL: <http://wiki.linuxfromscratch.org/blfs/ticket/8759>
BLFS Trac <http://wiki.linuxfromscratch.org/blfs>
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