[Gnumed-devel] server-client clock mismatches

[Karsten Hilbert]

On Fri, May 09, 2008 at 08:16:09AM -0700, James Busser wrote:

>> Since the public db
>> server syncs to NTP servers on the internet it keeps nearly
>> perfect time. So this suggests the clock on your client may
>> be off by some amount ?  There's more information on this in
>> the log file (such as the actual time diff etc). Note that
>> the code does try to adjust for wire roundtrip times. It
>> also accounts for time zone differences. I am interested in
>> a relevant log.

2008-05-09 08:14:01  DEBUG     gm.database 
(/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/logging/__init__.py
 @ #1072): maximum skew tolerance (seconds): 30
2008-05-09 08:14:04  INFO      gm.database 
(/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/logging/__init__.py
 @ #1072): server "now" (UTC): 2008-05-09 15:15:00.177112
2008-05-09 08:14:04  INFO      gm.database 
(/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/logging/__init__.py
 @ #1072): client "now" (UTC): 2008-05-09 15:14:04.711407
2008-05-09 08:14:04  DEBUG     gm.database 
(/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/logging/__init__.py
 @ #1072): wire roundtrip (seconds): 0.462917804718
2008-05-09 08:14:04  DEBUG     gm.database 
(/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/logging/__init__.py
 @ #1072): client/server time skew: 0:00:55.465705
2008-05-09 08:14:04  ERROR     gm.database 
(/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/logging/__init__.py
 @ #1072): client/server time skew > tolerance

The log indicates that client and server are off by roughly
one minute which isn't a whole lot.

What would people consider a reasonable boundary condition ?
1 minute, 2 minutes, 5 minutes ?

Karsten
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