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Re: [reSIProcate] DNS performance tuning

Well, it looks like you don't have any SRV records in your DNS, which is what the resolver tries looking for first. When that fails, it attempts an A query. So, you're having to wait for two DNS queries to finish in sequence, which would explain some amount of delay. How much delay are you seeing? 

Best regards,
Byron Campen


Hi,
I picked up a development build from svn last week and the RRCache code works great, thanks for the help on that one. However, I'm still seeing a big delay when DnsStub::Query::go: is first called. Is this because I'm 
specifying "transport=udp"?  Is there anything I can do to reduce or
eliminate this? I keep a DnsInterface thread running continuously for all my lookups so I don't need to restart it each time. I cant think of any problems with my mutex/condition that would prevent Query::go from starting. 

Regards,
Dave

Application code
----------------
Constructor for singleton wrapper class:
   dns = new ResipDnsInterface(*stub);
   dns->run();

Lookup code:
   Lock  lock(lookupCompleteMutex);
   Condition  dnsCond;
   DebugLog (<< "ResipDns::lookup - Looking up");
   dns->lookup(res, query.uri);
   DebugLog (<< "ResipDns::lookup - waiting for results");
   dnsCond.wait(lookupCompleteMutex); // signal sent from end of
DnsHandler::handle
   InfoLog (<< "ResipDns::lookup - DNS results for " << query.uri);

Stack trace
-----------
DEBUG | 20070119-163503.126 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
190616 | app.cpp:227 | ResipDns::lookup - Creating Uri:
sip:flammajobby.com;transport=udp
DEBUG | 20070119-163503.126 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
190616 | app.cpp:233 | ResipDns::lookup - Creating DnsResult
DEBUG | 20070119-163503.126 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
190616 | app.cpp:236 | ResipDns::lookup - Looking up
DEBUG | 20070119-163503.126 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
190616 | DnsResult.cxx:198 | DnsResult::lookup
sip:flammajobby.com;transport=udp
STACK | 20070119-163503.126 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 190616 | DnsResult.cxx:321 | Doing SRV lookup of _sip._udp.flammajobby.com DEBUG | 20070119-163503.126 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
190616 | app.cpp:250 | ResipDns::lookup - waiting for results
STACK | 20070119-163503.154 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 162926 | dns/DnsStub.cxx:375 | DnsStub::Query::go: _sip._udp.flammajobby.com 
type(enum): 33 proto: 1
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | DnsResult.cxx:912 | Received SRV result for: flammajobby.com
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | DnsResult.cxx:915 | DnsResult::onDnsResult() 0 status=4
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 162926 | DnsResult.cxx:978 | SRV lookup failed: _sip._udp.flammajobby.com 4 STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 162926 | DnsResult.cxx:1024 | No SRV records for flammajobby.com. Trying A 
records
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | dns/DnsStub.cxx:375 | DnsStub::Query::go: flammajobby.com
type(enum): 1 proto: 1
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | DnsResult.cxx:749 | Received dns result for: flammajobby.com
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | DnsResult.cxx:750 | DnsResult::onDnsResult() 0
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | DnsResult.cxx:771 | Adding [ V4 10.4.5.249:5060 UDP target
domain=flammajobby.com connectionId=0 ] to result set
DEBUG | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 162926 | app.cpp:66 | ResipDnsHandler::handle - received flammajobby.com STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 162926 | DnsResult.cxx:178 | Returning next dns entry: [ V4 10.4.5.249:5060 
UDP target domain=flammajobby.com connectionId=0 ]
DEBUG | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 162926 | app.cpp:74 | flammajobby.com -> [ V4 10.4.5.249:5060 UDP target 
domain=flammajobby.com connectionId=0 ]
STACK | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:DNS | 17423 | 
162926 | DnsResult.cxx:485 | Priming []
DEBUG | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
162926 | app.cpp:78 | ResipDnsHandler::handle - complete
INFO | 20070119-163503.155 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
190616 | app.cpp:253 | ResipDns::lookup - DNS results for
sip:flammajobby.com;transport=udp
INFO | 20070119-163503.156 | dcmlaptop | SmSipMgr | RESIP:APP | 17423 | 
190616 | app.cpp:260 | [ V4 10.4.5.249:5060 UDP target
domain=flammajobby.com connectionId=0 ]

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