CVS commit: src/sys/arch/x86/x86

["Kengo NAKAHARA" <knakahara%netbsd.org@localhost>]

Module Name:    src
Committed By:   knakahara
Date:           Fri Apr  3 03:05:39 UTC 2020

Modified Files:
        src/sys/arch/x86/x86: tsc.c

Log Message:
Fix TSC drift is observed almost every time wrongly.

Ths "TSC drift" in tsc_tc_init() means the cpu_cc_skew delta between
first measurement (in cpu_start_secondary) and second measurement
(in cpu_boot_secondary), that is, the TSC drift is expected to be
almost zero.  However, the second measument in current implementation
is added extra cpu_cc_skew accidentally, so current delta value means
almost cpu_cc_skew wrongly.

tsc_sync_bp and tsc_sync_ap should use rdtsc() to get raw values.

Advised by nonaka@n.o, thanks.


To generate a diff of this commit:
cvs rdiff -u -r1.38 -r1.39 src/sys/arch/x86/x86/tsc.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.