[Server-devel] RPi3 "poweroff" was consistently ~15sec, now consistently ~1.5min

[Adam Holt]

In January I and others were apparently spoiled.  Haitians I speak to want
the old shutdown efficiencies back, as they depend on VERY sparse
electricity, and therefore have to power off/on very often to
conserve...unlike us "rich" people who don't care to conserve.  In any
case, it now in February consistently takes ~1/5MIN to shut, and this is a
big problem for them.

Sometimes (rarely thankfully) it even takes ~3MIN to shut down, when I see
this on screen:

- "Stopping MariaDB database server" (appears for ~90sec, possibly due to
Ethernet/Internet cord recently unplugged)

*I always now the see the following on screen, while shutting down:*

- "Deconfiguring network interfaces" (appears for ~75sec)

Regardless whether Ethernet cord (leading to Internet) is attached or not.
If others can help advise how to crack this when many of us are in LA for
SCaLE next week, that'd be tremendous-  I can also post to the Raspbian
forums (https://www.raspberrypi.org/forums/viewforum.php?f=66) later too,
if that is advisable, and we're convinced this is Raspbian's doing...maybe
Josh Dennis can shed light?)


Extraneous (Likely Unrelated?) Observations:

   - Bootup takes likewise ~1.5min (sometimes more, sometimes less) but
   THAT is completely normal, due to extensive XSCE/IIAB services and X
   Windows etc on this installation (with Raspbian Pixel's desktop apps in
   this particuliar case).  So the full reboot, used take less than 2min
   earlier in Jan, consistently and wonderfully, a situation we eventually
   need to return to :)
   - "Raspbian 1.2 - February 2017" appears on the screen during the 2nd
   half of the bootup process, as "apt-get dist-upgrade" was run recently.
   It's entirely always possible Raspbian "upgrades" here made things worse.
   Something to look into, if I knew how!
   - RTC clock seems to lose a full 2 minutes, sometime during the 1st
   poweroff WITHOUT the Ethernet cord (and live Internet) plugged in.  Not the
   end of the world ($2 DS3231 RTC modules can't be perfect?) but very weird
   still.  The RTC seems to hold its time (erroneous time, falling 2 min into
   the past) consistently after that, even across many reboots, and
   true-disconnections for several minutes, completely turned off.  Of course
   NTP tidies up the time within seconds *after* the Ethernet/Internet cord is
   re-inserted.  Until Internet is lost again, and the clock mysteriously /
   rather suddenly wanders again :)
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