David, David Woolley wrote: > Thierry MARTIN wrote: > >> I have been trying acpi_pm clocksource for a few days now and the >> results are quite good :-). >> >> The time drift is less than 1s per day (I would even say less that 500ms >> but this has to be confirmed) which is much better than the default >> config with tsc (>2s /day). > > It's almost certain that the same hardware time source is used for both, > so discrepancies are likely to be attributable to software issues > (although those may include problems in calibrating the frequency of > various sources empirically, rather than by knowing how they derive from > the common source).
If you mean the same base oscillator on the motherboard then this may be the case. However, a bunch of clock signals with different clock rates are derived from those oscillators, and the fact that different clocksource modules yield different results make me assume that the problems are not with the base oscillator but with the different types of counters and/or the implementations of the modudules which use thos specific counters. See also http://bugzilla.kernel.org/show_bug.cgi?id=7963 Martin -- Martin Burnicki Meinberg Funkuhren Bad Pyrmont Germany _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
