[EMAIL PROTECTED] said: >>Most systems use the 32 KHz battery backed TOY (Time-of-Year) clock >> for timekeeping rather than the CPU crystal.
> Wrong, few systems do. Most systems use the 32.768 kHz xtal to run > their battery-backed Real Time Clock, but this is only consulted on > boot to get an initial fix on time. Thanks for the heads up. >>This is good because it's generally farther from the heat >> generating CPU than the CPU crystal. > This has no hold in reality. It's not what I was expecting. Several years ago, I was trying to match the temperature of the crystal with the observed drift. The data looked a lot better after Dave Mills pointed out that I was measuring the temperature of the wrong crystal. http://www.megapathdsl.net/~hmurray/ntp/drift.gif http://www.megapathdsl.net/~hmurray/ntp/drift-ex.gif I think he said it was done that way in order to support SMP systems. I'm pretty sure it works that way on this old Linux box. I probably jumped to the conclusion that it was more common than it is. Anybody got a list of which systems use which crystal? -- The suespammers.org mail server is located in California. So are all my other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited commercial e-mail to my suespammers.org address or any of my other addresses. These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
