On Fri, Oct 06, 2017 at 13:33 +0000, Mike Belopuhov wrote: > CVSROOT: /cvs > Module name: src > Changes by: mi...@cvs.openbsd.org 2017/10/06 07:33:53 > > Modified files: > sys/arch/amd64/amd64: identcpu.c > sys/arch/amd64/conf: files.amd64 > sys/arch/amd64/include: cpu.h cpuvar.h > sys/dev/acpi : acpihpet.c acpitimer.c > Added files: > sys/arch/amd64/amd64: tsc.c > > Log message: > Recalibrate TSC timecounter with HPET and PM timer > > If frequency of an invariant (non-stop) time stamp counter is measured > using an independent working timecounter that has a known frequency, we > can assume that the measured TSC frequency is as good as the resolution > of the timecounter that we use to perform the measurement. This lets us > switch from this high quality but expensive source to the cheaper TSC > without sacrificing precision on a wide range of modern CPUs. > > From Adam Steen <a...@adamsteen.com.au> with tweaks from reyk@ and myself. > > Tested by brynet@, sthen@ and others, OK mlarkin, sthen >
ACHTUNG! Please make sure to do a "make config" when building the kernel to update offset tables because of the cpu_info structure changes.
