[EMAIL PROTECTED] writes: >Developers at the University of Melbourne have produced a time-sync >client called "TSCclock" which exchanges standard NTP packets with a >NTP server. They assert that TSCclock, which runs on FreeBSD and at >least two flavors of Linux (Ubuntu and Fedora), provides substantially >better synchronization than ntpd both on a LAN and over the Internet.
>The following info is some of what is available: >1. The TSCclock page at the University of Melbourne: >http://www.cubinlab.ee.unimelb.edu.au/tscclock/ >2. A paper titled "Ten Microseconds Over LAN, for Free", originally >presented at the 2007 International IEEE Symposium on Precision Clock >Synchronization for Measurement, Control and Communication. This is >available at >http://www.cubinlab.ee.unimelb.edu.au/~darryl/Publications/ISPCS07_camera.pdf >It includes a general description of their approach and results for >both ntpd and TSCclock obtained in their testbed. The paper suffers from talking nonesense. NTP is certainly better than 1ms on a lan, and their data shows that the jitter is around .1-.2 ms. Exagerating the difference does not do them any favours. Note that chrony ( a 10 year old system) already gives 10usec for free on the lan. Futhermore their poll interval for their system is much higher than that of ntp. I get about .05 msec jitter for ntp on a lan, at least on my testbed. The ideas are interesting ( certainly their attempt to compensate for network jitter, their chief difference from ntp, is far superior to the clock filter approach of ntp, and I suspect superiour to the "weighting" approach of chrony ( the data is weighted by the inverse of the delay) >3. A one-hour Google Tech Talk: http://www.youtube.com/watch?v=o3nXgeh7v_U >All of the info on TSCclock that I have run across has originated with >the group at the University of Melbourne. Does anyone know of an >independent comparison between ntpd and TSCclock? >Thanks, >Gene _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions