[ntp:questions] high jitter on serial gps causes big time offsets

2013-04-05 Thread Nickolay Orekhov
Hello! I've got the following configuration: tos mindist 0.128 tinker panic 0 stepout 60 # TSIP,PPS reference clock server 127.127.8.0 mode 10 prefer maxpoll 3 true fudge 127.127.8.0 refid TSIP time1 0.08 server 127.127.22.0 maxpoll 3 fudge 127.127.22.0 refid PPSI The main goal: I want 1 ms or

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-05 Thread Robert Scott
On Fri, 5 Apr 2013 11:09:29 GMT, Nickolay Orekhov wrote: >Hello! >I've got the following configuration: > >tos mindist 0.128 >tinker panic 0 stepout 60 > ># TSIP,PPS reference clock > >server 127.127.8.0 mode 10 prefer maxpoll 3 true >fudge 127.127.8.0 refid TSIP time1 0.08 > >server 127.127.22.0

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-05 Thread unruh
On 2013-04-05, Nickolay Orekhov wrote: > Hello! > I've got the following configuration: > > tos mindist 0.128 > tinker panic 0 stepout 60 > > # TSIP,PPS reference clock > > server 127.127.8.0 mode 10 prefer maxpoll 3 true > fudge 127.127.8.0 refid TSIP time1 0.08 > > server 127.127.22.0 maxpoll 3

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-06 Thread Charles Elliott
tt > Sent: Friday, April 5, 2013 10:02 AM > To: questions@lists.ntp.org > Subject: Re: [ntp:questions] high jitter on serial gps causes big time > offsets > > On Fri, 5 Apr 2013 11:09:29 GMT, Nickolay Orekhov > wrote: > > >Hello! > >I've got the following

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-08 Thread Nickolay Orekhov
No I'm not a gps developer. Imagine that I've got very precise time according to GPS+PPS for a long period. After that GPS and PPS quality goes low and than quality of GPS serial high jitter clock will appear before low jitter PPS. Before selecting PPS, ntpd will do some adjustments according to

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-09 Thread Brian Utterback
On 04/08/13 07:50, Nickolay Orekhov wrote: No I'm not a gps developer. Imagine that I've got very precise time according to GPS+PPS for a long period. After that GPS and PPS quality goes low and than quality of GPS serial high jitter clock will appear before low jitter PPS. Before selecting PPS

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-13 Thread website . reader3
On Saturday, April 6, 2013 4:18:33 AM UTC-7, Charles Elliott wrote: > I would test the local clock before relying on it for time. In the bad old > days, around year 2000, when I first started processing SETI@Home (S@H) work > units (WUs), I could actually see that WUs were being processed faster i

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-13 Thread Uwe Klein
website.read...@gmail.com wrote: On Saturday, April 6, 2013 4:18:33 AM UTC-7, Charles Elliott wrote: I would test the local clock before relying on it for time. In the bad old days, around year 2000, when I first started processing SETI@Home (S@H) work units (WUs), I could actually see that

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-13 Thread David Woolley
website.read...@gmail.com wrote: I can obtain some precision crystals (+/- 2ppm) for about $8 to $10, + so why aren't they being added to the mid-level and up motherboards? $8-10 for the crystal would imply a total motherboard price of $2,000+. I think the big market for high end motherboards

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-13 Thread unruh
On 2013-04-13, website.read...@gmail.com wrote: > On Saturday, April 6, 2013 4:18:33 AM UTC-7, Charles Elliott wrote: >> I would test the local clock before relying on it for time. In the bad old >> days, around year 2000, when I first started processing SETI@Home (S@H) work >> units (WUs), I cou

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-13 Thread Mischanko, Edward T
$8-10 for the crystal would imply a total motherboard price of $2,000+??? Wouldn't that imply $210 vs. $200 price? Why $2,000+? > > website.read...@gmail.com wrote: > > > I can obtain some precision crystals (+/- 2ppm) for about $8 to $10, > + so why aren't they being added to the mid-level and

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-14 Thread David Taylor
On 13/04/2013 20:47, website.read...@gmail.com wrote: [] It is disgusting to buy a motherboard, load it with graphics processors, and memory and then find that the whole thing cannot keep time. I consider time keeping THE most neglected component in computer motherboards today. For most peop

Re: [ntp:questions] high jitter on serial gps causes big time offsets

2013-04-14 Thread Richard B. Gilbert
On 4/13/2013 5:09 PM, David Woolley wrote: website.read...@gmail.com wrote: I can obtain some precision crystals (+/- 2ppm) for about $8 to $10, + so why aren't they being added to the mid-level and up motherboards? $8-10 for the crystal would imply a total motherboard price of $2,000+. I th