In article <[EMAIL PROTECTED]>, Poul-Henning Kamp <[EMAIL PROTECTED]> writes >In message <[EMAIL PROTECTED]>, Geoff Powell writes: > >>So you'd recommend a 4501, with FreeBSD in Compact Flash? I wanted to >>use CF anyway, since a box running 24/7 is not the best environment in >>which to have moving parts. The box will have no more that NTP and MRTG >>on it. > >There isn't much I can add here, but I just want to add a few things: > >Sub-microsecond precision is impossible with regular crystals, end >of story. You need OCXO or Rb support for that.
Fine - I presume something like your web page about Soekris boards (where you characterised the performance of such a unit at ultimate precision) is the route to follow. I have follow-up plans for something similar further down the road. This year, next year, sometime, never... Meanwhile, FreeBSD with your patches on a NET4501 will give units of microseconds? > >If you don't need the SNMP capability, drop MRTG and use RRDtool, >(MRTG's more general sibling). Rats! Another app to learn! But you're right, SNTP is a gong - the bells and whistles I want are NTP stats. > >If you want to run MRTG or RRDtool, you probably do not want to use >a CF card: it will wear out - eventually. Don't trust more than a >year. Yes, I am aware of flash memory wear-out problems. I was thinking of NFS-mounting a directory elsewhere on my network as scratch space. > >I wrote a hack called "Remote RRD" which sends updates in UDP packets >to another host which hosts the RRD file and web-pages and all that >to get around this problem. Aha! A cure. Would you post a URL? Pretty please? > >-- >Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 >[EMAIL PROTECTED] | TCP/IP since RFC 956 >FreeBSD committer | BSD since 4.3-tahoe >Never attribute to malice what can adequately be explained by incompetence. > >_______________________________________________ >time-nuts mailing list >[email protected] >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > -- Geoff Powell _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
