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Date: Tue, 22 Aug 2000 10:12:13 +0900
From: Toshihisa Tsuji <tsuji-ml@105cs.co.jp>
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$B$3$s$K$A$ODT$H?=$7$^$9(B

FreeBSD 4.1-RELEASE$B$r(BCPU AMD K6 200MHz$B!"%^%6!<%\!<%I(BTX97-X$B$G;HMQ$7$F$$$k(B
$B$N$G$9$,!"$I$&$b<~GH?t$NFI$_<h$j$r4V0c$C$F$$$k$i$7$/!"$=$l$,860x$@$H;W$&(B
$B$N$G$9$,;~7W$,68$C$F$7$^$$:$$C$F$$$^$9!#2a5n$N%m%0Ey$rD4$Y$F$_$k$H(B
device apm0$B$r%3%a%s%H%"%&%H$9$k$+(B
options CLK_CALIBRATION_LOOP
options "CLK_USE_I8254_CALIBRATION"
options CLK_USE_TSC_CALIBRATION
$B$r;n$7$F$_$k$h$&$K$H8@$&;v$G?'!9$d$C$F$_$?$N$G$9$,:#$N$H$3$m8z2LL5$7$G$9!#(B
$B$A$J$_$K;~4V$,H>J,$N%9%T!<%I$G$7$+?J$^$J$$$N$G$9$,K\Mh(B200MHz$B$J$N$K(B
400MHz$B6a$$$b$N$HH=CG$5$l$F$$$k$;$$$@$H;W$C$F$$$^$9!#2a5n$N(B
/var/log/messages$B$r8+$F$_$k$H:G=i$N$3$m$O(B200MHz$B$HH=CG$5$l$F$$$?$h$&$G$9(B
$B$,:#$N>uBV$K$J$C$?;~$K2?$r$7$?$+$,ITL@$G$9!#$?$@%m%0$K=P$F$/$k%+!<%M%k$N(B
$B:n@.F|IU$,$*$+$7$/$J$kA0$b8e$bF1$8$@$C$?$N$G%+!<%M%k$O:n$jD>$7$F$J$+$C$?(B
$B$N$G$O$J$$$+$J$H;W$C$F$$$^$9!#0J2<?'!9;n$7$?7k2L$G$9!#(B

device apm0 $B$J$7$G%+!<%M%k%3%s%Q%$%k;~(B
>Aug 21 20:47:04 alice /kernel: Timecounter "i8254"  frequency 1193182 Hz
>Aug 21 20:47:04 alice /kernel: Timecounter "TSC"  frequency 382871622 Hz
>Aug 21 20:47:04 alice /kernel: CPU: AMD-K6tm w/ multimedia extensions (382.87-MH
>z 586-class CPU)

device apm0 $B$"$j$G%+!<%M%k%3%s%Q%$%k;~(B
>Aug 16 11:54:19 alice /kernel: Timecounter "i8254"  frequency 1193182 Hz
>Aug 16 11:54:19 alice /kernel: CPU: AMD-K6tm w/ multimedia extensions (382.87-MH
>z 586-class CPU)

options CLK_CALIBRATION_LOOP
options "CLK_USE_I8254_CALIBRATION"
options CLK_USE_TSC_CALIBRATION
$B$"$j$G(B boot -v$B$N%m%0(B
>Aug 21 21:46:32 alice /kernel: Calibrating clock(s) ... TSC clock: 201498466 Hz,
> i8254 clock: 614727 Hz
>Aug 21 21:46:32 alice /kernel: Press a key on the console to abort clock calibra
>tion
>Aug 21 21:46:32 alice /kernel: Calibrating clock(s) ... TSC clock: 201497789 Hz,
> i8254 clock: 614723 Hz
>Aug 21 21:46:32 alice /kernel: Calibrating clock(s) ... TSC clock: 200447188 Hz,
> i8254 clock: 608470 Hz
$B$$$+$h$/;w$??t;z$,B3$-2?$+%-!<$r2!$7$?8e(B
>Aug 21 21:46:32 alice /kernel: Calibrating clock(s) ... TSC clock: 186455759 Hz,
> i8254 clock: 608713 Hz
>Aug 21 21:46:32 alice /kernel: 614727 Hz differs from default of 1193182 Hz by m
>ore than 1%
>Aug 21 21:46:32 alice /kernel: Timecounter "i8254"  frequency 1193182 Hz
>Aug 21 21:46:32 alice /kernel: TSC clock: 396904005 Hz (Method B)
>Aug 21 21:46:32 alice /kernel: Timecounter "TSC"  frequency 396904005 Hz
>Aug 21 21:46:32 alice /kernel: CPU: AMD-K6tm w/ multimedia extensions (396.90-MH
>z 586-class CPU)

clock.c$B$bD/$a$F8+$?$N$G$9$,7k6I(B
>Aug 21 21:46:32 alice /kernel: 614727 Hz differs from default of 1193182 Hz by m
>ore than 1%
$B$,=P$?;~E@$G(BCLK_USE_TSC_CALIBRATION$B$r;XDj$7$?$N$HF1$8>uBV$K$J$j(B
> u_int64_t old_tsc = rdtsc();
>
> DELAY(1000000);
> tsc_freq = rdtsc() - old_tsc;
$B$NItJ,$G=P$F$/$k$N$,$"$N<~GH?t$J$s$@$m$&$J$!(B $B$0$i$$$7$+$o$+$j$^$;$s$G$7(B
$B$?!#$3$N>uBV$G9T$-5M$^$C$F$*$j$^$98e$O%O!<%I$r5?$&$/$i$$$7$+;W$$$D$+$J$$(B
$B$N$G$9$,!#2?$+>pJs$,$"$j$^$7$?$i$h$m$7$/$*4j$$$7$^$9!#(B

---
$BI48^%3%s%T%e!<%?%=%U%H3t<02q<R(B $B%7%9%F%`3+H/It(B
 $BDT(B $B5*5W(B tsuji@105cs.co.jp

