--------
Hal Murray writes:
> There is a huff-puff filter, I think it's optional.
I think it is more likely that the median-filter is causing trouble.
If you let the poll-rate ramp all the way up to 1024 seconds, the
median filter can get "stuck" for almost an hour before it notices
that something is horribly wrong[1].
These days there are almost no circumstances under which you should not
clamp your poll-rate to one minute "server bla maxpoll 6"
On a strange path like the ISS, I would clamp it to the minimum
16 seconds ('maxpoll 4').
When the backbone of the ARPAnet was 56kbit/s, being able to ramp
up to 1024 seconds poll rate made sense. It never makes sense now.
Poul-Henning
[1] The median filter should be automatically disabled and the most
recent sample used, if the samples in the shift register are
mononotonic or spread too much. That's another change I never
managed to "sell" to Dave Mills.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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