In message <[email protected]>, Attila Kinali writes:
>What surprises me though is the stability of the crystal. >In the months between reboots, there is less than +-1ppm variation, >The machine is a 16y old DEC PC, which has been used as a desktop DEC used way better crystals than the average PC-HW producers, so I am not very surprised. Not sure if this was just general good engineering or a panicy reaction to all the trouble the alphas gave them. They had a few machines that could slot either x86 of alpha CPU boards, and they were built from very high quality parts. >And why doesnt the >crystal relax back into it's old ppm value, but stays where it >is after a reboot/power cylce? You kernel tries to measure/estimate the crystal frequency at boot, it does not get the same value on every boot. Check your syslog/dmesg for the frequency estimate and you can see this clearly. -- 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] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
