Re: [chrony-users] How to plot statistics to show tracking accuracy?

2012-05-07 Thread Miroslav Lichvar
On Mon, May 07, 2012 at 05:06:55PM +0100, Ed W wrote: > So my theory is that gpsd is measuring the timestamp of the end of > the ZDA sentence (and working that back to get the initial > timestamp) and this gives an additional 0.5-1ms jitter that might > not be there if we measured the timestamp of

[chrony-users] How to plot statistics to show tracking accuracy?

2012-05-07 Thread Ed W
Hi, I'm getting very decent results with chrony and a usb gps. According to the statistics the std dev is around 1ms, which I might hope is slightly too high and that as low as 0.5ms is feasible? I think that this might indicate that we can do better measuring the arrival time of the $ in the

Re: [chrony-users] How to plot statistics to show tracking accuracy?

2012-05-07 Thread Bill Unruh
On Mon, 7 May 2012, Ed W wrote: Hi, I'm getting very decent results with chrony and a usb gps. According to the statistics the std dev is around 1ms, which I might hope is slightly too high and that as low as 0.5ms is feasible? I think that this might indicate that we can do better measuring