Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-14 Thread Joachim Fabini
Many thanks for sharing your logs and figures - they are really impressive. Comparing your figures to mine (standard Linux desktop, PCI RS232 card) it seems like the GPIO-based solution on embedded systems is capable to provide about a factor of 10 to 100 lower PPS jitter compared to Linux desktop

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-10 Thread Dan Drown
Quoting Gabs Ricalde : ... You can also improve the stability of the local clock by avoiding rapid temperature changes. This is the loopstats of a TL-WR841N placed inside a box where the temperature doesn't change that fast. https://imgur.com/a/eNT0k Rapid temperature changes also affects the

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-10 Thread Charles Swiger
On Sep 10, 2015, at 3:46 AM, Gabs Ricalde wrote: > TL-WR703N, polling GPIO driver, ntpd maxpoll 2 > https://imgur.com/a/ILF9Y > > The offset depends on these things: the stability of the local clock, > PPS jitter, and loop time constant (controlled by the poll interval

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-10 Thread Gabs Ricalde
On Wed, Sep 9, 2015 at 2:47 PM, Joachim Fabini wrote: > Comments inline > > On 08.09.2015 13:46, Gabs Ricalde wrote: >> On Tue, Sep 8, 2015 at 5:17 PM, Joachim Fabini >> wrote: >>> On 08.09.2015 09:44, Gabs Ricalde wrote: I've been running two devices (TPLink WR703N, MR3020) for more than 2

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-09 Thread Dan Drown
Quoting Joachim Fabini : : I'm really surprised, that's excellent. Do you have any figures how ntpd performs when using this PPS source? My earlier comment was relying on the assumption that the diagram displays the ntp log (loopstats) statistics. Until now, with Linux, desktop computers and rath

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-09 Thread Joachim Fabini
Comments inline On 08.09.2015 13:46, Gabs Ricalde wrote: > On Tue, Sep 8, 2015 at 5:17 PM, Joachim Fabini > wrote: >> On 08.09.2015 09:44, Gabs Ricalde wrote: >>> I've been running two devices (TPLink WR703N, MR3020) for more than 2 >>> years with almost no issue. Also impressed on what these dev

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-08 Thread Paul J R
On 8/09/2015 5:44 pm, Gabs Ricalde wrote: On Tue, Sep 1, 2015 at 3:22 AM, Paul J R wrote: Hi All, Thought I might share my experiences. Got given a little AR9331 based router some months ago (gl.inet 6416a) and spun up pps on one of its gpio lines. Its been running for about 2 months and so fa

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-08 Thread Gabs Ricalde
On Tue, Sep 8, 2015 at 5:17 PM, Joachim Fabini wrote: > On 08.09.2015 09:44, Gabs Ricalde wrote: >> I've been running two devices (TPLink WR703N, MR3020) for more than 2 >> years with almost no issue. Also impressed on what these devices could >> do. Does the new OpenWRT versions have the PPS driv

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-08 Thread Joachim Fabini
On 08.09.2015 09:44, Gabs Ricalde wrote: > I've been running two devices (TPLink WR703N, MR3020) for more than 2 > years with almost no issue. Also impressed on what these devices could > do. Does the new OpenWRT versions have the PPS driver for AR9331? I had > to use this for Attitude Adjustment:

Re: [ntp:questions] Atheros AR9331 w/GPS + PPS

2015-09-08 Thread Gabs Ricalde
On Tue, Sep 1, 2015 at 3:22 AM, Paul J R wrote: > Hi All, > > Thought I might share my experiences. Got given a little AR9331 based router > some months ago (gl.inet 6416a) and spun up pps on one of its gpio lines. > Its been running for about 2 months and so far the performance of it has > been q

[ntp:questions] Atheros AR9331 w/GPS + PPS

2015-08-31 Thread Paul J R
Hi All, Thought I might share my experiences. Got given a little AR9331 based router some months ago (gl.inet 6416a) and spun up pps on one of its gpio lines. Its been running for about 2 months and so far the performance of it has been quite impressive from a client perspective. Havent seen