In article <cakyj6kanol-pbm8d+kfcoceya6yi0chwphwgalxab8gowcg...@mail.gmail.com>, Paul <[email protected]> wrote:
> On Mon, Mar 17, 2014 at 8:50 AM, Joe Gwinn <[email protected]> wrote: > > > Yes. My question is basically a query about the current state of the > > art. > > > > Some NTP offsets (output may look funny if formatted) clock1 looking at > clock2 and clock3 (a Raspberry Pi). This suggests it can be as good as > your IRIG system. > > Gig ethernet to Gig ethernet. ~22 days: > N Min Max Median Avg Stddev > 244059 -0.098741335 0.019727433 9.586e-06 4.814598e-06 > 0.00038621792 > > Gig to Fast ~10 days > N Min Max Median Avg Stddev > 112254 -0.000516264 0.000453913 1.127e-06 6.8736914e-06 > 4.2248166e-05 People are also lusting after sub-microsecond sync. It isn't enough to have good averages; the excursions also matter - the 19.7 millisecond max would be a killer. I've gotten NTPv3 to sync two slow Solaris boxes over 10 Mbit thicknet to about 7 microseconds rms, but it was in a isolated lab setup. The slightest random load in the Solaris boxes would have gotten us back to millisecond scale. But my question is about the state of the art in PTP systems, not systems in general. Joe Gwinn _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
