On 08/24/2017 10:24 AM, frank wrote: > Hi, > > On 08/24/2017 10:03 AM, Richard Cochran wrote: >> On Thu, Aug 24, 2017 at 09:31:26AM +0200, frank wrote: >>> i have a small number (3-10) of beagle bone blacks observing sensor >>> events, and measuring the relative timing between these events. >> >> And how are these multiple boards connected to each other? > > There are two or three 5-port switches which are all connected. I think > there were two switches used when the pmc command shown was run. > > 4 ports are used for the beagles and the 5th port is connected to the > next switch.
Hi, I have checked the kernel messages of one of the nodes with a large ptpoffset and found the following log messages: Mon May 22 08:03:08 2017 kern.err kernel: [ 428.840562] cpts: unable to obtain a time stamp Mon May 22 08:03:14 2017 kern.err kernel: [ 434.887720] cpts: unable to obtain a time stamp Mon May 22 08:03:16 2017 kern.err kernel: [ 436.860546] cpts: event pool is empty Mon May 22 08:03:16 2017 kern.err kernel: [ 436.864419] cpts: unable to obtain a time stamp Mon May 22 08:03:19 2017 kern.err kernel: [ 439.744010] cpts: event pool is empty I have searched the mailing-list and it looks like this was mentioned before, unfortunately I found no clear outcome. kind regards Frank ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
