Re: [chrony-users] Massive difference between NTP clocks and PHC

2016-10-14 Thread Miroslav Lichvar
On Fri, Oct 14, 2016 at 12:26:05PM +0100, Denys Rtveliashvili wrote: > I see that "linuxptp" has configured chrony to connect to PTP0 (shared > memory segment) rather that PHC0 (direct connection to a PHC clock). I > wonder if that makes any real difference. One difference is that the SHM

Re: [chrony-users] Massive difference between NTP clocks and PHC

2016-10-14 Thread Denys Rtveliashvili
Thank you very much everyone. I have almost figured it out. The first problem was that there was a typo in the network address of the PTP port. PTP packets still arrived but it somehow made the system unhappy. The second thing was that the configuration of ptp4l had some kind of a problem.

Re: [chrony-users] Massive difference between NTP clocks and PHC

2016-10-14 Thread Miroslav Lichvar
On Fri, Oct 14, 2016 at 02:57:23AM -0700, Bill Unruh wrote: > On Fri, 14 Oct 2016, Denys Rtveliashvili wrote: > > I have tried adding PHC to the configuration of chrony and see things like > > What is PHC? Could it be trailing-vs-leading-edge-of-a-pulse problem? It's a clock on a network card,

Re: [chrony-users] Massive difference between NTP clocks and PHC

2016-10-14 Thread Miroslav Lichvar
On Fri, Oct 14, 2016 at 10:38:00AM +0100, Denys Rtveliashvili wrote: > PHC0 is a clock on an Intel card running under igb driver. > The PTP port of the card is connected to a PTP-enabled Cisco Nexus switch, > which is connected to a PTP grandmaster. The same grandmaster in fact, which > is also a

Re: [chrony-users] Massive difference between NTP clocks and PHC

2016-10-14 Thread Bill Unruh
William G. Unruh __| Canadian Institute for| Tel: +1(604)822-3273 Physics _|___ Advanced Research _| Fax: +1(604)822-5324 UBC, Vancouver,BC _|_ Program in Cosmology | un...@physics.ubc.ca Canada V6T 1Z1 | and Gravity __|_ www.theory.physics.ubc.ca/ On Fri, 14 Oct 2016,