3 ms·

esr is working on a small gps timing device to test bloat: Announcement: http://esr.ibiblio.org/?p=4171 http://esr.ibiblio.org/?p=4171 Update: http://esr.ibib

• astrodust 14y ago
  I've read about his GPS adventures before, but I didn't know what it was for. Is this to be able to inject packets with precisely known start times for measuring latency across the network?
  • dfc 14y ago
    He is also the maintainer of gpsd so some of the gps material might have been for the gpsd project in general. From what I understand the GPS device is just used for getting accurate time stamps (via gpsd not ntp reference implementation). It is odd because no self respecting time-nut[1] would use PPS over usb, too much jitter. But the meat of the project will be the system for measuring latency so its not vital that the measuring nodes have microsecond offset agreement. [1] http://www.leapsecond.com/time-nuts.htm http://www.leapsecond.com/time-nuts.htm