Bind-9.7.1 multi thread question (FreeBSD)

[Bind]

Hello
I compiled Bind971 on FreeBSD 8 (amd64).
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./configure --prefix=/opt/
--enable-threads --sysconfdir=/opt/config --localstatedir=/opt/
--sbindir=/opt/named --datarootdir=/opt/ --enable-shared=no
--with-openssl
everything is ok and it works. but when i get top command,,freebsd returns 
many named processess which are run,,is it ok?(on my previous installed 
bind9.6 on solaris it didnt show these in prstat -a)
PID USERNAME  THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
  396 root        7  49    0  3207M  2575M kqread  3 725:01 19.97% named
71422 root        1  44    0 28652K  8768K select  1   0:46  0.00% snmpd
  882 root        1  44    0  5864K  1512K select  0   0:00  0.00% syslogd
 1117 root        1  44    0  6920K  1588K nanslp  2   0:00  0.00% cron
  543 root        7  44    0 20640K 11844K kqread  0   0:00  0.00% named
  637 root        7  44    0 20640K 11888K kqread  2   0:00  0.00% named
  531 root        7  44    0 20640K 11844K kqread  0   0:00  0.00% named
  725 root        7  44    0 20640K 11888K kqread  2   0:00  0.00% named
  602 root        7  44    0 20640K 11888K kqread  2   0:00  0.00% named
  679 root        7  44    0 20640K 11844K kqread  2   0:00  0.00% named
  597 root        7  44    0 20640K 11888K kqread  0   0:00  0.00% named
  695 root        7  44    0 20640K 11844K kqread  2   0:00  0.00% named
  684 root        7  44    0 20640K 11888K kqread  1   0:00  0.00% named
  613 root        7  44    0 19616K 11800K kqread  1   0:00  0.00% named
  555 root        7  44    0 20640K 11844K kqread  1   0:00  0.00% named
  625 root        7  44    0 20640K 11888K kqread  0   0:00  0.00% named
  846 root        7  44    0 20640K 11888K kqread  1   0:00  0.00% named
  707 root        7  44    0 20640K 11888K kqread  3   0:00  0.00% named
 1128 root        7  44    0 20640K 11856K kqread  0   0:00  0.00% named
 1360 root        7  44    0 20640K 11924K kqread  1   0:00  0.00% named
70665 root        7  44    0 20640K 11924K kqread  0   0:00  0.00% named
 1376 operator    7  44    0 20640K 11904K kqread  0   0:00  0.00% named
 1337 operator    7  44    0 20640K 11948K kqread  0   0:00  0.00% named
 1252 operator    7  44    0 20640K 11948K kqread  3   0:00  0.00% named
 1276 operator    7  44    0 20640K 11904K kqread  3   0:00  0.00% named
 1232 operator    7  44    0 20640K 11948K kqread  1   0:00  0.00% named
 1298 root        7  44    0 20640K 11880K kqread  0   0:00  0.00% named
 1319 operator    7  44    0 20640K 11948K kqread  3   0:00  0.00% named
71374 operator    7  44    0 19616K 11856K kqread  1   0:00  0.00% named
70559 operator    7  44    0 20640K 11904K kqread  3   0:00  0.00% named
70630 root        7  44    0 20640K 11880K kqread  0   0:00  0.00% named
70443 operator    7  44    0 20640K 11948K kqread  2   0:00  0.00% named
70612 root        7  44    0 20640K 11924K kqread  3   0:00  0.00% named
70590 operator    7  44    0 20640K 11904K kqread  1   0:00  0.00% named
70464 operator    7  44    0 20640K 11904K kqread  0   0:00  0.00% named
71884 root        1  44    0 10352K  3800K CPU0    0   0:00  0.00% top
 1304 root        7  44    0 20640K 11876K kqread  1   0:00  0.00% named
70618 root        7  44    0 20640K 11880K kqread  0   0:00  0.00% named
70519 root        7  44    0 20640K 11880K kqread  1   0:00  0.00% named

why does top show these and is it normal operation or i made a mistake?
Regards
Iman
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