Hal Murray wrote: > I'm running Fedora Core 6 on a 2.8 GHz P4/Xeon (2 hyperthreaded CPUs). > I'm running a 2.6.19 kernel - my own config file, no changes to the > official sources. > > I just updated a whole bunch of software (yum update) and rebooted > my system. (same kernel) > > NTP's drift went from 151 ppm to 115 ppm. > > Has anybody seen anything like that? Any hints on where I should > start looking? > > I'm pretty sure I saw something like this a while ago, probably in > the other direction. but I didn't investigate. I think I have > enough log files to find it if that is likely to help. There may > have been a kernel switch. >
This happened to me once. I think I was using acpi_pm as my clocksource in the Linux kernel, then I compiled ACPI out of the Linux kernel and rebooted. Oops. Each Linux clocksource has its own frequency. On my PC, it's about 33.2 PPM for acpi_pm, 35.5 PPM for pit, and 95.3 for tsc. Whether tsc works differently on a 2-CPU system, I don't know. If ntpd was stable on 151 PPM, and now it's stable on 115 PPM, maybe that's what happened. Michael _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
