Rune Torgersen writes: > The main couse is that our main bus frequency cannort be divided into > 1kHz evently by the decrementer. > Main bus freq = 99532800 Hz. > Decrementer then becomes 24883, which gives us 999991.9624485600nsec per > jiffy. > That is not a number easilly converted into time without drift.
That shouldn't be a problem any more with the CONFIG_GENERIC_TIME stuff. What happens is that update_wall_time will accumulate clock->xtime_interval to xtime for every clock->cycle_interval timebase ticks. The clock->xtime_interval is in units of 2^-22 nanoseconds, so it is very accurate. It is computed from clock->cycle_interval and clock->mult in clocksource_calculate_interval() (in include/linux/clocksource.h). Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
