Re: [ntp:questions] Have Pi, have GPS = low powered NTP server?

2012-08-06 Thread David Taylor
On 06/08/2012 23:35, bealevi...@gmail.com wrote: In case of interest, I got NTP with PPS from a GPS receiver running on the Raspberry Pi. My peak error (looking at the kernel's PPS timestamps) went from about +/- 2 msec using remote NTP servers, to about 60 usec with PPS enabled (limited by va

Re: [ntp:questions] Have Pi, have GPS = low powered NTP server?

2012-08-06 Thread bealevideo
In case of interest, I got NTP with PPS from a GPS receiver running on the Raspberry Pi. My peak error (looking at the kernel's PPS timestamps) went from about +/- 2 msec using remote NTP servers, to about 60 usec with PPS enabled (limited by variability in the R-Pi's interrupt latency.) Using

Re: [ntp:questions] WARNING: someone's faking a leap second tonight

2012-08-06 Thread Richard B. Gilbert
On 8/6/2012 8:44 AM, Dick Wesseling wrote: In article <501d6636.9050...@gmail.com>, Jeffrey Lerman writes: On Fri, Aug 03 2012 at 5:42PM, Harlan Stenn wrote: It looks like this recently-filed (and cryptically-named) ntpd bug might be related to the bogus leap seconds? http://bugs.nt

Re: [ntp:questions] WARNING: someone's faking a leap second tonight

2012-08-06 Thread Dick Wesseling
In article <501d6636.9050...@gmail.com>, Jeffrey Lerman writes: > > > On Fri, Aug 03 2012 at 5:42PM, Harlan Stenn wrote: > > It looks like this recently-filed (and cryptically-named) ntpd bug might > be related to the bogus leap seconds? > http://bugs.ntp.org/show_bug.cgi?id=2246 "sy

Re: [ntp:questions] GPS/NTP and High Frequency Trading

2012-08-06 Thread Uwe Klein
blu wrote: An interesting article today at "The Big Picture": http://www.ritholtz.com/blog/2012/08/could-gps-spoofing-cause-another-flash-crash/ It says GPS throughout the article, but at least some of the time it really means NTP. He. High Frequency Trading is an annihilating black hole o