The network transit time over software loopback should be minimal, but network
transit time isn't the only thing which contributes to overall RTT.
Sounds like your named process is struggling to keep up with 5000 QPS. Have you
looked at the memory, CPU? Are you running with a single thread, or multiple
threads? Are you bumping into operating-system limits (which are, depending on
platform, tunable in named.conf)? There could be a lot of reasons why named
gets backed up in processing requests, and these aren't necessarily evident
from doing a simple dig against an otherwise-idle named instance.
- Kevin
From: [email protected]
[mailto:[email protected]] On Behalf Of ???
Sent: Tuesday, November 04, 2014 4:39 AM
To: [email protected]
Subject: Unexpected srrt in loopback
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)
[email protected]<mailto:[email protected]>
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