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ATTENTIONATTENTION:
Please make sure that you read /usr/local/share/doc/clockspeed/INSTALL.
It contains important information about testing and configuring
clockspeed, and finally installing it in your system.
Clockspeed uses the libtai library, check /usr/ports/devel/libtai
for more details. TAI time measure is off 22 seconds from UTC time
measure. Therefore, your system time will show a 22 secs difference
from your time source after you've installed this port.
To fix this, you could follow this simple recipe created with
PR ports/27617.
1) killall clockspeed (you can't have it running)
2) sntpclock IP.OF.NTP.SERVER | clockadd
3) enable/start clockspeed :
% cp /usr/local/etc/rc.d/clockspeed.sh.sample \
/usr/local/etc/rc.d/clockspeed.sh
# enable clockspeed to automagically start next
# time you reboot. do this after testing everything
% /usr/local/etc/rc.d/clockspeed.sh start
# start clockspeed now
4) sntpclock IP.OF.NTP.SERVER > /usr/local/etc/clockspeed/adjust
5) cd /usr/src/share/zoneinfo
6) make -DLEAPSECONDS clean all install ; make clean
Step 5 and 6 build support in your system for leapseconds handling.
Take a note about this since you might forget later to disable it
if you remove this port. To disable it, simply re-do step 6 without
-DLEAPSECONDS.
Step 6 should not break anything but you can disable it anytime
as per last paragraph if you think something unusual has happened
to your system.
7) /stand/sysinstall -> configure -> time zone (choose the correct
time zone for your system)
8) sntpclock IP.OF.NTP.SERVER | clockview
Check how close is your clock before and after now. Should be
within milliseconds.
Do not forget to add a cron(8) job with step 4 to periodically
adjust clockspeed's drift rate. Once a week should be more than
adequate.
A port to non-i386 platforms was done using the clock_gettime(2)
function. Since this is somewhat experimental, there might be some
tiny precision differences from the i386 platform versions. You
have been warned!
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