Re: [ntp:questions] Loopstats jitter field mostly zero?

2013-01-11 Thread Charles Elliott
Your could make one up, for integer arithmetic; the method does not work for floating point. The method is called low-cost inverse residue codes and is in Avižienis, A. (1971). Arithmetic Error Codes: Cost and Effectiveness Studies for Application in Digital System Design. Reliable Computer System

Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board

2013-01-11 Thread Richard B. Gilbert
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer

Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board

2013-01-11 Thread Richard B. Gilbert
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer

Re: [ntp:questions] X2 assert and clear events (PPS) on LInux with sure GPS Board

2013-01-11 Thread Richard B. Gilbert
On 1/9/2013 7:09 PM, unruh wrote: On 2013-01-09, thelastroman...@live.fr wrote: Hi, Thanks, it seems to work. So, i just need nanoseconds precision with this 1pps on my localhost, don't need NTP or other. You will NOT get nanosecond precision. If that is your goal, give up now. No computer

Re: [ntp:questions] Loopstats jitter field mostly zero?

2013-01-11 Thread Steve Kostecke
On 2013-01-11, james machado wrote: >> http://www.jhauser.us/arithmetic/TestFloat.html >> http://www.netlib.org/fp/ (see UCBTEST) > > i've spent the last two days trying to get the UCBTEST to compile on > the RPi with no luck. there are some defines the ieee.c file wants > that I just don't grok

Re: [ntp:questions] Loopstats jitter field mostly zero?

2013-01-11 Thread Steve Kostecke
On 2013-01-11, james machado wrote: > i've spent the last two days trying to get the UCBTEST to compile on > the RPi with no luck. there are some defines the ieee.c file wants > that I just don't grok. As far as TestFloat it requires SoftFloat > which has fallen off the interwebs. If you have

Re: [ntp:questions] how to configure ntp for conditional use of servers, depending on my LAN status?

2013-01-11 Thread Rob
dar8...@eml.cc wrote: > hi, > > i'm running ntp-4.2.6p5-3.10.1.x86_64 on linux/64. > > i've a question about proper configuration/use of fallback on a roaming > laptop. > > the laptop boots to a no-network configuration. connection is > chosen/enabled as needed after KDE desktop launch ... > > i'

Re: [ntp:questions] how to configure ntp for conditional use of servers, depending on my LAN status?

2013-01-11 Thread Rob
Marco Marongiu wrote: > On 09/01/13 20:21, dar8...@eml.cc wrote: >> i'm not sure if/how to implement this conditional fallback 'logic' for >> ntp's server selection. > > I had a similar problem, and I use cfengine to solve that: depending on > the network to which I am attached, my ntpd gets a dif