CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2024/02/23 16:01:15
Modified files:
sys/kern : kern_tc.c
Log message:
timecounting: start system uptime at 0.0 instead of 1.0
OpenBSD starts the system uptime clock at 1.0 instead of 0.0. We
inherited this behavior from FreeBSD when we imported kern_tc.c.
patrick@ reports that this causes a problem in sdmmc(4) during boot:
the sdmmc_delay() call in sdmmc_init() doesn't block for the full
250ms. This happens because the system hardclock() starts at 0.0 and
executes about hz times, rapidly, to "catch up" to 1.0. This
instantly expires the first hz timeout ticks, hence the short sleep.
Starting the system uptime at 0.0 fixes the problem.
Prompted by patrick@. Tested by patrick@. In snaps since Feb 19 2023.
Thread: https://marc.info/?l=openbsd-tech&m=170830229732396&w=2
ok patrick@ deraadt@
