Re: [time-nuts] Tracking NTP displacement and correlation betweentwo clients.

2012-10-05 Thread Hal Murray
bow...@gmail.com said: The problem is that they start in sync and over the course of a day drift that far apart despite having NTP running. We're not sure why NTP isn't correcting it along the way. Though at this point, we are looking at a firmware bug. I wouldn't think of it as two systems

Re: [time-nuts] Tracking NTP displacement and correlation betweentwo clients.

2012-10-05 Thread bownes
Comments inline. On Oct 5, 2012, at 18:26, Hal Murray hmur...@megapathdsl.net wrote: bow...@gmail.com said: The problem is that they start in sync and over the course of a day drift that far apart despite having NTP running. We're not sure why NTP isn't correcting it along the way.

Re: [time-nuts] Tracking NTP displacement and correlation betweentwo clients.

2012-10-04 Thread David J Taylor
The problem stems from one of the two (identical) machines drifting off by 60-70 seconds per day. So a few ms here and there are ok. [] Bob == Bob, NTP is normally limited to a +/- 500 parts per million correction - 43 seconds per day. You may be operating

Re: [time-nuts] Tracking NTP displacement and correlation betweentwo clients.

2012-10-04 Thread Bob Bownes
David, The problem is that they start in sync and over the course of a day drift that far apart despite having NTP running. We're not sure why NTP isn't correcting it along the way. Though at this point, we are looking at a firmware bug. Thanks! Bob On Oct 5, 2012, at 12:30 AM, David J Taylor

Re: [time-nuts] Tracking NTP displacement and correlation betweentwo clients.

2012-10-04 Thread David
I had an early Phenom II that lost time while turned on but the internal CMOS clock did not so rebooting or reading the CMOS clock restored the correct time. There was a problem with the System Management Mode code and The C1E CPU state which was new at that time where an interrupt was being