[ntp:questions] ntp.drift file
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Thu Dec 9 03:36:37 UTC 2010
In article <AANLkTinTLFbOJ+qcWC1G8n-Oy88_YyPcuBOHXS2i5gwX at mail.gmail.com>,
Dave Hart <davehart at gmail.com> writes:
> Newer versions are more adaptive depending on how much the value is
> changing, but historically it was once an hour, and I believe in the
> latest ntp-dev it is no more often than once per hour, less if the
> value isn't changing much.
ntp-dev has a nonvolatile parameter in ntp.conf.
Specify the threshold in PPM to write the frequency file, with
default 0.1 PPM. The frequency file is inspected each hour. If the
difference between the current frequency and the last value written
exceeds the threshold, the file is written and the threshold becomes
the new threshold value. If the threshold is not exceeded, it is
reduced by half. This is intended to reduce the frequency of unnecessary
file writes for embedded systems with nonvolatile memory.
These are my opinions, not necessarily my employer's. I hate spam.
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