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From: Taoka Fumiyoshi <fmysh@iijmio-mail.jp>
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Date: Wed, 14 Jan 2004 19:20:11 +0900
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Subject: [FreeBSD-users-jp 77917] Re: Pentium4 HT
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X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+031216

smp(4) $B$h$jH4?h(B

| FreeBSD supports hyperthreading on Intel CPU's on the i386 platform.  By
| default, logical CPUs are not used to execute user processes due to per-
| formance penalties under common loads.  To allow the logical CPUs to exe-
| cute user processes, turn off the machdep.hlt_logical_cpus sysctl by set-
| ting its value to zero.

$B@[Lu(B
  FreeBSD$B$O(Bi386$B%W%i%C%H%U%)!<%`$G$N(BInetl CPU$B$N(Bhyperthreading$B$r%5%]!<%H$7$^$9!#(B
  $B%G%U%)%k%H$G$O!"0lHLE*$JIi2Y$G$N%Q%U%)!<%^%s%9%Z%J%k%F%#$N$?$a$K!"(B
  $BO@M}(BCPU$B$O%f!<%6!<%W%m%;%9$r<B9T$9$k$N$K$OMQ$$$i$l$^$;$s!#(B
  $BO@M}(BCPU$B$K%f!<%6!<%W%m%;%9$r<B9T$5$;$k$K$O!"(Bmachdep.hlt_logical_cpus
  sysctl$B$NCM$r(B0$B$K@_Dj$9$k$3$H$G!"%*%U$K$7$F$/$@$5$$!#(B

$BC1=c$K!V(BCPU$B$,Fs8DF0$$$F$$$k$h$&$K8+$($k$h$&$K$J$k!W$H$$$&(B
$B0UL#$G$O9,$;$+$b$7$l$^$;$s$,!"(B
$BO@M}(BCPU$B$rF0$+$7$FK\Ev$K%a%j%C%H$,$"$k$+$I$&$+$O!"(B
$B8D!9$N4D6-$G%A%'%C%/$9$kI,MW$,$"$k$H;W$$$^$9!#(B

