resolving from loopback is much smooth?

[Eric Yiu]

Hi,

I run bind dns server 9.9 now with around 3000query/s.  I recently upgrade
our server to Fujitsu M10-1 Solaris 10 with bind9.10.
I feel that the server serving bind is not as fast as old one in intel
solaris which was more than 8 years ago.  I tried a few test
and found that dig @localhost is much more smooth thatn dig @IP the zone at
the machine.

Try dig resolving from loopback:

bash-3.2# i=0; while [ $i -lt 20 ]; do i=`expr $i + 1`; /usr/local/bin/dig @
127.0.0.1 a <ALocalZoneWWWRecord>  |grep "Query time"; sleep 1; done
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec

Try dig resolving from server real IP:

bash-3.2# i=0; while [ $i -lt 20 ]; do i=`expr $i + 1`; /usr/local/bin/dig
@<TheServerRealIP> a <ALocalZoneWWWRecord> |grep "Query time"; sleep 1; done
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 215 msec
;; Query time: 0 msec
;; Query time: 112 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 0 msec
;; Query time: 170 msec
;; Query time: 167 msec
;; Query time: 145 msec
;; Query time: 193 msec
;; Query time: 2 msec
;; Query time: 17 msec
;; Query time: 26 msec
;; Query time: 138 msec
;; Query time: 2 msec
;; Query time: 324 msec

Sometimes it even need more than 2000msec to resolve.

Just wonder if it is normal behavior, or anything can be tuned?  Thanks

Eric
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