[Pdns-users] High latency on recursion without cache

Ciro Iriarte cyruspy at gmail.com
Sun Jan 25 13:33:34 UTC 2015


2015-01-20 22:28 GMT-03:00 Ciro Iriarte <cyruspy at gmail.com>:

> 2015-01-19 16:57 GMT-03:00 bert hubert <bert.hubert at powerdns.com>:
>
> On Fri, Jan 16, 2015 at 01:34:45PM -0300, Ciro Iriarte wrote:
>> > This were the queries sent from a client:
>> >
>> > 2015-01-16 13:04:38 dig @server 3.redhat.pool.ntp.org <-- NXDOMAIN, my
>> > mistake
>> > 2015-01-16 13:15:35 dig @server 2.redhat.pool.ntp.org <-- NXDOMAIN, my
>> > mistake
>> > 2015-01-16 13:15:52 dig @server 2.centos.pool.ntp.org <-- NOERROR
>>
>> Hi Ciro,
>>
>> Sadly your trace is interleaved with a bunch of other queries which make
>> it
>> harder to see what is going on.
>>
>> The trace for '2.centos.pool.nto.org' stops in the middle:
>>
>> Jan 16 13:15:53 rdns4m01 pdns_recursor[7294]: [2]    dns2.udel.edu.:
>> accept answer 'adns3.upenn.edu.|AAAA|2607:f470:1003::3:c' from 'edu.'
>> nameservers? YES!
>> Jan 16 13:15:53 rdns4m01 pdns_recursor[7294]: [2]    dns2.udel.edu.:
>> determining status after receiving this packet
>> Jan 16 13:15:53 rdns4m01 pdns_recursor[7294]: [2]    dns2.udel.edu.: got
>> NS record 'udel.edu.' -> 'dns1.udel.edu.'
>>
>> How did you gather or select the trace output? Is it possible you missed
>> some output?
>>
>> Also, what Lua scripts do you run? Might these be interfering in some way?
>>
>>         Bert
>>
>
> Hi!, it seems that the rsyslog rate limit (default) feature is working too
> well. I disabled that for this trace capture, I also disabled the Lua
> script just in case, but the timing is roughly the same. This is a new try:
>
>
> ### Query from client
> https://paste.ee/p/ov8EY
>
> ### Trace on the server
> https://paste.ee/p/JLtOX
>
> ### Traffic dump
> https://www.cloudshark.org/captures/9f9ee80f40fe
>
> Regards!,
>
> --
> Ciro Iriarte
> http://iriarte.it
> --
>

Also, the test traffic was stopped, so the trace file should be complete
and cleaner!.

Regards,

-- 
Ciro Iriarte
http://iriarte.it
--
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