From owner-FreeBSD-tech-jp@jp.freebsd.org  Thu Aug  6 00:19:30 1998
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Message-Id: <199808051517.AAA19974@volvo.kom.comm.waseda.ac.jp>
To: FreeBSD-tech-jp@jp.freebsd.org
In-reply-to: Your message of "Wed, 05 Aug 1998 20:48:16 JST."
             <199808051148.UAA02697@toto.noc.titech.ac.jp> 
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Date: Thu, 06 Aug 1998 00:17:55 +0900
From: Yasuyuki OKASE <yokase@volvo.kom.comm.waseda.ac.jp>
Reply-To: FreeBSD-tech-jp@jp.freebsd.org
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X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+980729
X-Sequence: FreeBSD-tech-jp 1689
Subject: [FreeBSD-tech-jp 1689] Re: Disk write speed 
Errors-To: owner-FreeBSD-tech-jp@jp.freebsd.org
Sender: owner-FreeBSD-tech-jp@jp.freebsd.org

$B2,@%$G$9!#(B

> > $B$b$7$+$7$F(BFreeBSD$B$N(BDISK-IO$B$C$FCY$$$s$G$7$g$&$+!)(B
> 
> AIX$B$N(B $B$=$N%^%7%s$HHf$Y$F$O(B $B$I$&$@$+$o$+$j$^$;$s$,!"(B
> SCSI$B$O(B $BCY$$$G$9!#(BIDE$B$O(B FreeBSD 3.X $B$K$J$k$HAa$$$G$9!#(B
> 
> 	$B!v!v!v(B
> 
> http://www.jp.qmail.org/ $B$NCf$K(B
>   FreeBSD$B$G$N(BDisk$B%"%/%;%9$NB.EY(B(random write)$B$NHf3S(B
> $B$N%Z!<%8$,$"$j$^$9!#$=$3$r8+$F$d$C$F$/$@$5$$!#(B
> 
> $BH`$ND4$Y$K$h$k$H(B
> 
> IDE$B$K$D$$$F$O(B
>   2.X$B7O(B 3.X$B7O(B $B$H$b(B FreeBSD$B$NJ}$+$i(B Disk$BK\BNB&$N(Bwrite cache$B$rM-8z$K$7$F(B
>   $B$$$k$N$G8z2L$,8=$l$F$$$k!#$3$l$,$+$J$j8z$/!#(B
>   2.X$B7O$O(B DMA$B%"%/%;%9$O;H$($J$$!#(B
>   3.X$B7O$O(B DMA$B$,;H$($k$N$GAa$$!#(B
>   2.X$B7O$O(B 32bit$B%"%/%;%9$J$I$b(B off$B$K$J$C$F$$$k!#$3$l$O(B kernel$B$N(B
>   wd$B%G%P%$%9$N(B flag$B;XDj$G@_Dj$9$k!#(Bman wd $B;2>H!#(B
> 
> SCSI$B$K$D$$$F$O(B
>   2.X$B7O(B 3.X$B7O(B $B$H$b(B FreeBSD$B$NJ}$+$i(B Disk$BK\BNB&$N(Bwrite cache$B$rM-8z$K$G$-(B
>   $B$F$$$J$$$H;W$o$l$k!#$I$&$7$F$=$&H=CG$9$k$+$H$$$&$H!"(B
>   Linux$B$K$O(B IDE disk$B$N(B write cache$B$r(B on/off$B$9$k%3%^%s%I$,$"$k$=$&$G!"(B
>   (FreeBSD$B$K$O$J$$(B) $B$3$l$r;H$C$F(B write cache$B$r(B off$B$K$7$?$i(B $B$b$N$9$4$/(B
>   $BCY$/$J$C$?!#(B
>   Disk$B%a!<%+$OF1$8Cf?H(B($BHD(B)$B$r;H$C$F(B IDE$B$H(B SCSI$BHG$r=P$7$F$$$k$N$G!"(B
>   SCSI$B$N?t;z$,6a$$(B IDE$B$N(B write cache off$B$N?t;z$K;w$F$$$k$N$O(B
>   SCSI$B$b(B write cache off $B$K$J$C$F$$$k$H;W$$$?$$!#(B
>    (SCSI$B%+!<%I$N%I%i%$%P$d(B $B%3%s%H%m!<%i(Bchip$B$N%*!<%P!<%X%C%I$b$"$k$G$7$g(B
>     $B$&$,(B $B$=$l$K$7$F$bCY$$(B)

(JSCSI$B$N(JHDD$BB&$N%i%$%H%P%C%/%-%c%C%7%e!J(JSCSI$BE*$K$O!"=q$-9~(B
$B$`%G!<%?%V%m%C%/$r<u$1<h$C$?;~E@$G!"%G%#%9%/$X$N=q$-9~$_(B
$B=*N;$rBT$?$:$K!"=q$-9~$_=*N;$H$7$F%$%K%7%(!<%?$KJs9p$9$k!"(B
$B$H$$$C$?Dj5A$K$J$C$F$$$?$H;W$$$^$9!#<BAuE*$K%i%$%H%P%C%/(B
$B%-%c%C%7%e$K$J$C$F$$$k$b$N$,$[$H$s$I$G$7$g$&$1$I!#!K$r!"(B
$BM-8z$K$9$k$+!"L58z$K$9$k$+$O!"(JOS$B$,7h$a$FA`:n$9$Y$-$J$N$G(B
$B$7$g$&$+!#(B

$B;d$N8D?ME*$J9M$($G$O!"(JOS$B$O>!<j$KA`:n$9$Y$-$G$O$J$$$H;W$$(B
$B$^$9!#%f!<%6$,L@<(E*$KJQ99$r;X<($7$F;O$a$FJQ99$5$l$k$Y$-(B
$B$G$9!#$H$$$&$N$b!"F0:nB.EY$h$j$b0BA4$rM%@h$9$k%f!<%6$O!"(B
$B%i%$%H%P%C%/$rL58z$K$9$k!J=q$-9~$_<:GT$N>l9g$K$O!"$=$N(B
$B%3%^%s%I$,<:GT$9$k$N$G!"$9$0$K%$%K%7%(!<%?$O<:GT$rG'<1(B
$B$9$k$3$H$,$G$-$k!#!K$7!"0BA4$h$j$bF0:nB.EY$rM%@h$9$k(B
$B%f!<%6$O!"%i%$%H%P%C%/$rM-8z$K$9$k!J=q$-9~$_$r<B:]$K(B
$B9T$&A0$K!"=q$-9~$_40N;$rJs9p$9$k$N$G!"=q$-9~$_$K<:GT(B
$B$7$?>l9g$K$O!"LLE]$J$3$H$K$J$k!#!K$Y$-$@$+$i$G$9!#(B

$B$J$N$G!"(JSCSI$B$N%I%i%$%P<~$j$r$$$8$i$:$K!"%i%$%H%P%C%/(B
$B%-%c%C%7%e$NM-8z(J/$BL58z$O!"(Jscsi(8)$B%3%^%s%I$G@_Dj$9$Y$-(B
$B$G$9!#$?$@!"(JSCSI$B$N$3$H$r$h$/M}2r$7$F$$$J$$$H!"Hs>o$K(B
$B;H$$$K$/$$%f!<%6%$%s%?%U%'%$%9$@$H;W$$$^$9$,!#(B

$B$[$H$s$I$N%G%#%9%/$O!"IT4xH/NN0h$K5-21$5$;$k$3$H$,(B
$B$G$-$k$N$G!"5/F0;~$KKh2s%9%/%j%W%H$G<B9T$9$kI,MW$b!"(B
$B$^$:$J$$$H;W$$$^$9!#(B

--
$BAa0pEDBg3XM}9)3XItEE;R!&>pJsDL?.3X2J>.>>8&5f<<(BB5 $B2,@%(B $B9/G7(B
E-mail: yokase@kom.comm.waseda.ac.jp
http://www.kom.comm.waseda.ac.jp/~yokase/index-j.html


