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To: FreeBSD-users-jp@jp.FreeBSD.org
From: Kenichi Okuyama <okuyamak@dd.iij4u.or.jp>
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Date: Sat, 25 Jun 2005 18:52:22 +0900
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Subject: [FreeBSD-users-jp 85544] Re: Linux
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$BT|;3$G$9!#(B

>>>>> "SN" == SAKIYAMA Nobuo <sakichan@sakichan.org> writes:
>> $B$=$7$F!"$3$l$O2?EY$b2?EY$b2?EY$b(B fs-devel $B$G5DO@$5$l$F$$$k$N$K!"$=$N(B
>> $B$?$S$K%G%P%$%9%I%i%$%P!<$N$;$$$K$7B3$1$F(B file system $BAX$O<+J,$NLdBj(B
>> $B$@$HM}2r$7$J$$!#$3$l$G$O!"D>$k$o$1$,$J$$!#;H$o$l$J$$%$%s%?!<%U%'!<%9(B
>> $B$OAa5^$K>C$5$l$k$@$m$&$7!#(B
SN> $B$H$$$&$3$H$O!"Nc$($P(B Xen $B$G%I%a%$%s(B0 $B$K(BFreeBSD$B$d(BNetBSD$B$r$b$C$F$-$F(B
SN> Linux$B$O$[$+$N%I%a%$%s$GF0$+$9$3$H$G(B I/O $B4X78$O(B FreeBSD $B$KG$$;$k!"$H$$(B
SN> $B$&%"%W%m!<%A$r$H$C$F$b5_$o$l$J$$$H$$$&$3$H$K$J$k$N$G$7$g$&$+!)(B


Xen $B$G$O(B raw IO $B$J$I$GH/9T$9$k%j%/%(%9%H$N<oN`$r!"C/$,7h$a$k$N$G$9$+(B?
$BNc$($P!"(BHDD $B$K=q$-$?$$$H$7$^$7$g$&!#(B

  1) $B%G!<%?$r(BHDD $B$KE>Aw$9$k(B
  2) HDD $B$N(B cache $B$r(B flush $B$9$k(B(platter $B$K=q$/(B)

$B$H$$$&$N$,(B *BSD $B$NN.57!"(B

  1) $B%G!<%?$r(B HDD $B$KE>Aw$9$k(B

$B$G=*$o$k$N$,(B Linux $B$NN.57!#(B

$B2>$K!"(BLinux $B>e$G(B raw $B%G%P%$%9$r3+$$$F%G!<%?$rN.$79~$_$^$7$?!#(B
$B$3$N%G!<%?$r$I$N$h$&$K(B HDD $B$KEA$($k$N$+!"$r7h$a$F$$$k$N$O!DC/(B?

Linux $B$J$i$P(B NG$B!#(B NetBSD $B$J$i$P%;!<%U!#$=$&$$$&$3$H$G$9!#(B


$B%3%3$+$i@h$O?dB,$G$9$,!"B?J,!"$3$N>l9g$O(B Linux $B$K$OK\Ev$N%G%P%$%9$O(B
$BB8:_$7$J$/$F!"(BXen $B$N5!G=$,2>A[%G%P%$%9$N$U$j$r$7$F!"B(:B$K(B *BSD $B$KEj(B
$B$2$F$$$k$G$7$g$&!#(B*BSD $B$O(B cache flush $B$r$9$k$7!"$3$l$,40N;$7$F$+$iJV$C(B
$B$F$/$k$N$G$9$+$i!D$=$l$^$G$O(B Linux $B$N%I%i%$%P$O!V=*$o$C$F$$$J$$!W;v(B
$B$K$J$C$F$$$k!#(B

$B$@$+$iBg>fIW$@$H;W$$$^$9$1$I$M!#(B
---- 
$B1|;3(B $B7r0l(B[$BGaGX2q(B:No.0x00000001]
#URL http://www.dd.iij4u.or.jp/~okuyamak/
#    http://slashdot.jp/journal.pl?op=display&uid=2487
#    http://developer.osdl.jp/projects/doubt/
#$B:#F|$N$*8@MU!X26$N!"26$N!"(BOS$B$NOC$r$-$1!A!A!A!Y(B:$B$5$FLdBj$O(B
#$B;D$j$NItJ,$r$I$&$9$k$+$G!D!#(B
