Hi, Thanks a lot. Is it possible to reduce the offset of the phc2sys.
-Maheen On Sun, Jan 17, 2021 at 10:24 PM Richard Cochran <richardcoch...@gmail.com> wrote: > On Sun, Jan 17, 2021 at 04:51:19PM +0100, Maheen Iqbal wrote: > > ptp4l[7405.869]: rms 19 max 27 freq -95696 +/- 18 delay -1 +/- 0 > > ptp4l[7406.869]: rms 18 max 29 freq -95715 +/- 13 delay 1 +/- 0 > > > but when I am running the phc2sys with the below mentioned command the > > offset is around 3 to 4 digit which is much larger and i think they are > not > > synchronized. > > Actually your results are quite typical. The ptp4l program uses > hardware time stamping, but the phc2sys uses software time stamping, > and that results in larger error in offset measurements. > > > phc2sys[7392.422]: CLOCK_REALTIME phc offset 673 s2 freq -178087 delay > 770 > > phc2sys[7393.422]: CLOCK_REALTIME phc offset -434 s2 freq -178992 delay > 770 > > phc2sys[7394.422]: CLOCK_REALTIME phc offset -547 s2 freq -179235 delay > 760 > > phc2sys[7395.422]: CLOCK_REALTIME phc offset -975 s2 freq -179827 delay > 770 > > phc2sys[7396.422]: CLOCK_REALTIME phc offset -1678 s2 freq -180823 delay > 760 > > These phc2sys numbers are not bad at all. > > HTH, > Richard >
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