> -----Original Message----- > From: Richard Cochran [mailto:richardcoch...@gmail.com] > Sent: Friday, March 27, 2015 2:31 AM > To: Keller, Jacob E > Cc: linuxptp-devel@lists.sourceforge.net > Subject: Re: [Linuxptp-devel] how to measure frequency offset without > correcting? > > On Thu, Mar 26, 2015 at 10:28:58PM +0000, Keller, Jacob E wrote: > > I am attempting to use phc2sys and debug some new hardware, and I > want > > to be able to sort of "free-running" mode measure the difference clock > > offset and frequency offset, but without actually passing corrections. > > If you have a reasonably good GM, and you trust the device's time stamps, > then one easy way is to just use ptp4l with the free_running option. You > can set the observation window with the freq_est_interval option. > > HTH, > Richard
When I tried that it still seemed to modify the PTP clock. At any rate, I tried Gary's suggestion which worked well.. Turns out the clock is about 2300 ppm(!!) off according to chronyd Thanks for the suggestions! Regards, Jake ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
