From: ss@astec.co.jp (Sakashita Shiu)
Subject: Re: SUN UFS -- Re: q: traffic on network
Followup-To: fj.unix
Organization: ASTEC, Inc. Tokyo, Japan
	<YAMAGATA.93Jan24215752@tithp3.phys.titech.ac.jp>
Distribution: fj
Date: Thu, 28 Jan 1993 05:50:37 GMT

>In article <YAMAGATA.93Jan24215752@tithp3.phys.titech.ac.jp>
>	 yamagata@phys.titech.ac.jp (Soh Suzuki) writes:
>   >	USENIX 1991 Summer$B$G$N(B
>   >	$B!V(BExtent-like performance from UNIX File System$B!W$rFI$s$@8B$j(B
>   >	$B$G$O!"(BFFFS$B$H$[$\F1Ey$N$b$N$,<BAu$5$l$F$$$k$h$&$K;W$o$l$^$9!#(B
>    $B$&!<!"$G$O$3$NO@J8$NFbMF$O(B reno $BHG(B UFS $B$H$O4X78$J$$$N$G$7$g$&$+!#(B
>   $B$3$NK]Lu$O(B reno $BHG$N@-G=$NOC$O=q$$$F$$$J$/$F!"(BSunOS 4.1 $B$H(B 4.1.1 $B$NHf3S(B
>   $B$G$7$?!#(B
>	   $BEl5~9)6HBg3X(B $BJ*M}3X2J(B $BNkLZ(B $BAo(B

$B$^$:>e$NOC$O!"!V;W$o$l$^$9!W$,K\<A$G$9!#$D$^$j!"??<B$O$o$+$j$^$;$s!#(B 
SunOS$B$N(BUFS$B$N%=!<%9$r8+$?$3$H$,$J$$$+$i$G$9!#$?$@!"$"$J$,$A$&$=$G$O$J$$(B
$B$h$&$K;W$$$^$9!#(B

$B$^$:!"(BSunOS$B$N?7$7$$(BUFS$B$NK\<A$O!"(B

1. rotdelay=0 $B$H(Bmaxcontig > 1 
2. VM$B$H%U%!%$%k%7%9%F%`$N07$$$,!"%+!<%M%kFb$G$OE}9g$5$l$F$$$k(B

$B$H$$$&$3$H$G$9!#$^$:!"(Brotdelay=0 $B$H(Bmaxcontig > 1 $B$H$J$C$F$$$k$+$I$&$+$r(B
$BD4$Y$F$_$^$9!#$3$l$O(Bdumpfs$B$H$$$&%3%^%s%I$G$o$+$j$^$9!#(B

retour$ dumpfs /dev/sd0a | head
magic   11954   format  dynamic time    Thu Jan 28 14:24:10 1993
nbfree  279     ndir    77      nifree  4250    nffree  26
ncg     3       ncyl    36      size    8208    blocks  7495
bsize   8192    shift   13      mask    0xffffe000
fsize   1024    shift   10      mask    0xfffffc00
frag    8       shift   3       fsbtodb 1
minfree 10%     optim   time    maxcontig 7     maxbpg  2048
rotdelay 0ms    rps     60
ntrak   12      nsect   38      npsect  38      spc     456
trackskew 0     interleave 1

$B$5$F!"$D$.$K!"(BFFFS$B$r:NMQ$7$F$$$k(B($B$H=q$$$F$"$k(B)NEWS-OS 4.2R$B$r8+$F$_$^$9!#(B
$B$9$k$H!"$*$J$8$h$&$K(Bdumpfs$B$,$"$j!"$_$F$_$k$H!"(B

	maxcontig 16
	rotdelay 0ms

$B$H$J$C$F$$$^$9!#$H$$$&$3$H$O!"$I$&$b(BFFFS$B$H(BSunOS$B$N?7$7$$(BUFS$B$NK\<A$N(B1$B$D(B
$B$OF1$8$J$h$&$K8+<u$1$i$l$^$9!#(B

$B$5$F!"(B386bsd$B$N(Bufs_alloc.c$B$r$A$g$C$H$@$1$_$F$_$k$H!"(B

	If a section is already partially allocated, the policy is to
	contiguously allocate fs_maxcontig blocks.  

$B$J$I$d!"(B

         One or more previous blocks have been laid out. If less
         than fs_maxcontig previous blocks are contiguous, the
         next block is requested contiguously, otherwise it is
         requested rotationally delayed by fs_rotdelay milliseconds.


$B$H$"$j$^$9!#$J$N$G!"(Bmaxcontig$B$N%"%$%G%#%"$O$3$A$i$K$b$"$k$h$&$G$9(B
($B$b$A$m$s!"(BFFFS$B$,:G=i$+$bCN$l$^$;$s$,!"$o$?$7$K$O3NG'$G$-$^$;$s(B)$B!#(B

$B$J$N$G!"(BSunOS$B$N?7$7$$(BUFS$B$H8E$$(BUFS$B$H$NHf3S$O!"(BFFFS$B$H(BFFS$B$NHf3S$HCV$-49$((B
$B$F$b$=$l$[$ILdBj$J$$$@$m$&$H9M$($F!">e$N$h$&$K=q$-$^$7$?!#(B

p.s.	SunOS$B$N?7$7$$(BUFS$B$N<B8=$H!"(B386bsd$B$N(Bufs$B$N$"$?$j$O(B
	$BM=A[$I$*$j$+$J$j0c$&$h$&$G$9$M!#(B

	$B$=$l$H!"(BFFFS$B$NO@J8$,$I$3$+$K$"$j$^$;$s$+(B? USENIX$B$O(B
	$BA4It8+$?$N$G$9$,!"$A$g$C$H8+Ev$?$j$^$;$s!#(BSIGOPS$B$H$+(B
	$B$rC5$9$N$+$7$i!#(B
-- 
-----------
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