On Wed, Apr 30, 2008 at 6:19 PM, Bill Unruh <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] (maxime louvel) writes: > > >On Tue, Apr 29, 2008 at 6:27 PM, Unruh <[EMAIL PROTECTED]> wrote: > > >> [EMAIL PROTECTED] (maxime louvel) writes: > >> > >> >Hi, > >> > >> >I have know run a lot of tests. > >> >Just to let you know what I've got so far. > >> >I have tried NTP, and NTP + PTP (Precision Time Protocol). > >> >I haven't tried Chrony nor TSClock. > >> >I have used the software only implementation of PTP (ptpd). > >> > >> >With NTP only I have got an accuracy around 1ms, > > Actually, I have no idea what the difference is between the "software > implimentation" of PTP and standard NTP is. The advantage of PTP is the > HARDWARE timestamping of the packets as they come into the ethernet card > (special purpose ethernet cards with clocks on board) and possibly PTP > aware switches which race through the PTP packets without delay. > Software only means > that PTP uses exactly the same kernel routines, etc. to read the computer > clock as does ntp I assume. I cannot see how it can be better unless there > are some > severe bugs in NTP. > What version of NTP are you running? > I have get the last tar archive from the ntp website, and compiled it. PTPd is a software only implementation which try to manage as it can without hardware. You get less accuracy than normal PTP, but still it's not so bad. > > _______________________________________________ > questions mailing list > questions@lists.ntp.org > https://lists.ntp.org/mailman/listinfo/questions > -- Maxime Louvel 0044 7964 5555 80 43 Allen road Whitemore reans WV60AW Wolverhampton United Kingdom _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
