[ntp:questions] Slow convergence of NTP with GPS/PPS
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Tue Oct 21 21:58:23 UTC 2008
>> The driftfile also sometimes seems to do more harm than good - especially
>> after a reboot.
>Some kernels do a calibration of clock against RTC clock. This will make
There is a bug in the Linux calibration routine for the TSC mode
clock. It doesn't get a consistent answer. I hacked the code
to loop and print the answer. It was a splatter. None were far
off unless you are a time keeping geek. It's easy to see the
different drift results and startup transients are "interesting".
clocksource=acpi_pm on the boot command line might help.
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