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From: Shunsuke SHINOMIYA <shino@fornext.org>
To: FreeBSD-users-jp@jp.FreeBSD.org
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$B!!<D5\$G$9!#(B

> $B%P%9$d%a%b%j$,%\%H%k%M%C%/$K$J$k$K$O!"$^$@$^$@$@$H;W$&$N$G$9$,!"2?$,%\%H%k%M%C%/$K(B
> $B$J$C$F$$$k$N$G$7$g$&!)(B

$B!!3d9~$_!A%Q%1%C%H=hM}$NItJ,$@$H;W$$$^$9!#(B

$B!!(BXeon 2.8GHz$B$G$=$l$J$j$KB.$$@\B3(B(32bit 33MHz$B$N(BPCI$B$G$OCY$$!"$H$$$&DxEY%K%e(B
$B%"%s%9$G(B)$B$N!"$=$l$J$j$N(BGbE$B$G$"$l$P!"(B1Gbps$B$rKd$a$i$l$k$H;W$$$^$9!#(B

$B!!$?$@$7!"<j85$N(BXeon 2.4GHz(FSB 400MHz)+$B%*%s%\!<%I$N(Bem$B$r%k!<%?$H$7$FF0$+(B
$B$7$?>l9g!"%9%k!<%W%C%H$O$?$+$@$+(B120kpps$BDxEY$7$+=P$^$;$s$G$7$?!#(B
# Ethernet100Mbps$B$G$N%o%$%d%l!<%H$,(B145kpps$BDxEY$J$N$G!"$=$l$K$bK~$?$J$$(B

$B!!:#2s0KF#$5$s$,9T$o$l$?;n83$O0lBf$N(BPC$B$OAw?.$@$1!"$b$7$/$O<u?.$@$1$7$+9T$C(B
$B$F$$$J$$$N$G!"$b$C$HB?$/$N%Q%1%C%H$r07$($k$H;W$$$^$9$,!"%*!<%@!<$OJQ$o$i(B
$B$J$$$G$7$g$&!#(B

$B!!2>$K(B120kpps$B$GAw?.$G$-$?$H$7$F$b!"$=$l$G(B1Gbps$B$rKd$a$k$K$O!"(B
1Gbps/120kpps = 1042octet$B$J$N$G!"(B1042octet($B;~4V(B)$B0J>e$N(BEterhnet$B%U%l!<%`$r(B
$BEj$2$kI,MW$,$"$j$^$9!#(B
$B!!(Bnetrate$B$O(BUDP$B$G%Q%1%C%H$rEj$2!"$=$N(BEthernet$B!"(BIP$B!"(BUDP$B%X%C%@$d%W%j%"%s%V(B
$B%k!"(BIFG$B$J$I$N(B1$B%Q%1%C%H$"$?$j$N%*!<%P%X%C%I$O(B66octet$B$G$9$N$G!"(Bnetsend$B$G;X(B
$BDj$9$k%Q%1%C%H$N%5%$%:$O(B976octet$B!"%Q%1%C%H%l!<%H$O@h$N(B120000pps$B$K$J$j$^(B
$B$9!#(B

$B!!$^$?!"%Q%1%C%H$N<u?.%l!<%H$r(Btcpdump$B$G3NG'$5$l$F$$$^$9$,!"(Btcpdump$B$O$=$l(B
$B$J$j$N%W%m!<%V8z2L$,$"$k$H;W$$$^$9!#(Bnetstat$B$GE}7W>pJs$r8+$?J}$,!"$^$@1F(B
$B6A$O>.$5$$$H;W$$$^$9!#(B


# $B$3$3$+$i$O!"A[A|$,$?$/$5$s$G$9(B
$B!!(Bnetstat$B!"(Bsystat$B$J$I$GI=<($5$l$k%G!<%?%l!<%H$O!"(BEthernet$B%U%l!<%`$N$&$A!"(B
Ethernet$B$N%X%C%@(B(14octet)$B!"%W%j%"%s%V%k(B(8octet)$B!"(BFCS(4octet)$B!"(B
IFG(12octet)$B$r4^$s$G$$$J$$$H;W$$$^$9(B($BD4$Y$F$J$$$G$9!#D4$Y$m$h(B>$B<+J,(B)$B$N$G!"(B
$B$3$3$GI=<($5$l$k%l!<%H$O!"<B:]$KEj$2$h$&$H$7$F$$$k%Q%1%C%H$N%G!<%?%l!<%H(B
$B$H$O$^$?0c$C$?CM$K$J$k$H;W$$$^$9!#(B
$B!!$*$=$i$/!"(BEthernet$B%U%l!<%`$N%Z%$%m!<%I$@$1$N%+%&%s%H$@$H;W$$$^$9$N$G!"(B
$B>e5-$N%X%C%@$J$I(B($B7W(B 38octet)$B$r:9$70z$$$?CM$K$J$k$HA[A|$G$-$^$9!#(B

$B!!$J$N$G!">e5-$N(BGbE$B$rKd$a$k>l9g$O!"(B
$B!&(B120Kpps$B$G!"(B1042octet$B;~4VJ,$N%Q%1%C%H$rEj$2$?$$(B
$B!&(Bnetrate$B$G;XDj$9$k%Q%i%a!<%?$O%5%$%:$,(B976octet$B!"%Q%1%C%H%l!<%H$,(B120Kpps
$B!&$7$+$7!"<B:]$K$O(B1042octet$B$N$&$A!"(B38octet$B$O(BEthernet$B$N%*!<%P%X%C%I$J$N$G!"(B
  1004octet * 120Kpps = 120.48MBps = 963.84Mbps$BDxEY$NCM$,(Bsystat -ifstat 
  $B$GI=<($5$l$kCM$H$J$k(B
$B$N$G$O$J$$$+$H;W$$$^$9!#(B

-- 
Shunsuke SHINOMIYA <shino@fornext.org>

