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Date: Tue, 22 Aug 2000 13:02:49 +0900
From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
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tsuji-ml> >options         TIMER_FREQ=614727
tsuji-ml> $B$r2C$($k$H(B
tsuji-ml> >Aug 22 12:09:21 alice /kernel: Timecounter "i8254"  frequency 614727 Hz
tsuji-ml> >Aug 22 12:09:21 alice /kernel: Timecounter "TSC"  frequency 197250028 Hz
tsuji-ml> >Aug 22 12:09:21 alice /kernel: CPU: AMD-K6tm w/ multimedia extensions (197.25-MH
tsuji-ml> >z 586-class CPU)
tsuji-ml> $B$H$J$j$+$J$j$b$H$N?t;z$K6a$E$-$^$7$?!#$3$l$G@8$^$l$F$/$k8m:9$0$i$$$J$i(B
tsuji-ml> ntpdate$B$"$?$j$G2?$H$+$9$k$+!"?tCM$rJQ$($k;v$G85$N?tCM$K9g$o$;$k;v$O=PMh(B
tsuji-ml> $B$=$&$J5$$,$9$k$N$G$9$,!"$3$l$O$D$^$j(Bi8254$B%?%$%^!<$,$*$+$7$/$J$C$F$k$H8@(B
tsuji-ml> $B$&;v$J$N$G$7$g$&$+!)(B(i8254$B$,2?$+$h$/$o$+$C$F$$$J$$$N$G$9$,(B...)
tsuji-ml> 
tsuji-ml> $B$A$J$_$K%m%0$K;D$C$F$$$?@5$7$$$3$m$NCM$O$3$s$J46$8$G$9(B
tsuji-ml> >Aug 14 18:12:40 alice /kernel: Timecounter "i8254"  frequency 1193182 Hz
tsuji-ml> >Aug 14 18:12:40 alice /kernel: CPU: AMD-K6tm w/ multimedia extensions (200.46-MH
tsuji-ml> >z 586-class CPU)

i386 $B$N>l9g$O(B, mc146818A $B$H$$$&IC%+%&%s%?!<$,Hf3SE*@53N$i$7$/(B,
$B$3$l$r4p=`$K$7$F(B, calibration $B$7$^$9(B.
$BK\Mh$J$i$P(B, i8254 $B$O(B 1$BIC4V$K(B 1193182 $B2sA08e(B count $B$7$F$$$k$O$:$J$N$G$9$,(B,
$BDT$5$s$N(B machine $B$O$=$NH>J,$0$i$$$7$+(B, counter $B$,?J$_$^$;$s(B.
$B860x$O$h$/$o$+$j$^$;$s$,(B, $B2u$l$F$$$k$N$+=i4|2=$K<:GT$7$F$$$k$N$+$b$7$l$;$s(B.
$B$"$^$j$K8m:9$,Bg$-$$$N$G(B, OS$B$O$=$NB,Dj$rL5;k$7$F(B, 1193182 Hz$B$@$H(B
$B;W$C$F(B, TSC(CPU$B$K$"$k(Bcounter)$B$N(B  calibration $B$r9T$J$$$^$9(B.
$BCY$$;~7W(B(i8254)$B$G7W$k$N$G(B, CPU $B$N(B clock $B$,B.$/$J$C$F$7$^$$$^$9(B.

OS($B;~9o$r4IM}$9$kItJ,(B)$B$K$H$C$F$O(B, $B;~7W$,Aa$+$m$&$,CY$+$m$&$,(B,
$B$=$N@53N$J<~4|$5$($o$+$l$PLdBj$"$j$^$;$s(B.
($BB>$NItJ,$X$NI{:nMQ$O$"$k$+$b$7$l$^$;$s$,(B)

mother board $B$N(B bus clock $B$b7k9=$"$F$K$J$i$J$$$N$G(B,
CPU $B$N(B clock $B$,CzEY(B 200MHz $B$K9g$;$k$N$,NI$$$H$b8B$j$^$;$s(B. 

mc146818A $B$r?.$8$k$J$i$P(B, CLK_USE_I8254_CALIBRATION $B$r;H$($PNI$$$G$7$g$&(B.
$BHf3SE*?.Mj$N$*$1$k(B ntp server $B$K>o;~@\B3$G$-$k$N$G$"$l$P(B,
kernel PLL $B$r(B enable $B$K$7$F(B,

# ntpdc -c kern
pll offset:           -0.000216242 s
pll frequency:        11.555 ppm
maximum error:        0.032283 s
estimated error:      1.9e-05 s
status:               2001  pll nano
pll time constant:    6
precision:            1e-09 s
frequency tolerance:  496 ppm

$B$J$I$G=P$F$/$k(B pll frequency $B$,(B 0 $B$K6a$/$J$k$h$&$K(B
TIMER_FREQ $B$rD4@a$9$k$N$,NI$$$H;W$$$^$9(B.
$B$3$NCM$O5$29Ey$K$h$C$F$b$+$J$jJQF0$7$^$9$N$G(B, 10 ppm $BA08e$G$b==J,$@$H(B
$B;W$$$^$9(B.

/\ Hidetoshi Shimokawa
\/  simokawa@sat.t.u-tokyo.ac.jp
PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp


