Unexpected srrt in loopback

[万润夏]

Hi everyone, I try to set up an authentic bind server in the loopback
address(127.0.0.1) in our recursive server of our testbed for test reason.
When I send a large number of junk queries(5000QPS), the srrt of loopback
server in cash is unexpectedly large. Does anyone know the reason? The srrt
is normal when I dig or ping the loopback server by the way.
The dump_cache.db’s content:

; Address database dump
;
; 10.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6
success]
;	240c:f:1:122::13 [srtt 212] [flags 00002000] [ttl 1746]
; 8.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::11 [srtt 744] [flags 00002000] [ttl 1746]
; 3.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::6 [srtt 171] [flags 00002000] [ttl 1746]
; 9.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::12 [srtt 44] [flags 00002000] [ttl 1746]
; 4.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::7 [srtt 64] [flags 00002000] [ttl 1746]
; 13.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6
success]
;	240c:f:1:122::16 [srtt 26] [flags 00002000] [ttl 1746]
; 5.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::8 [srtt 29] [flags 00002000] [ttl 1746]
; 12.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6
success]
;	240c:f:1:122::15 [srtt 2054] [flags 00002000] [ttl 1746]
; 6.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::9 [srtt 663] [flags 00002000] [ttl 1746]
; 1.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::2 [srtt 550] [flags 00002000] [ttl 1746]
; 11.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6
success]
;	240c:f:1:122::14 [srtt 44] [flags 00002000] [ttl 1746]
; 7.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::10 [srtt 918] [flags 00002000] [ttl 1746]
; 2.root-servers.net [v4 TTL 10744] [v6 TTL 86344] [v4 nxrrset] [v6 success]
;	240c:f:1:122::5 [srtt 360] [flags 00002000] [ttl 1746]
; Unassociated entries
;
;	::1 [srtt 689] [flags 00002000] [ttl 1745]








Best Regards
Runxia Wan



---------------
Runxia Wan(Brian)
Research Engineer
BII Lab
Beijing Internet Institute(BII)
rxwan at biigroup.cn


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