[Pdns-users] High latency on recursion without cache

bert hubert bert.hubert at powerdns.com
Tue Jan 27 09:59:25 UTC 2015

On Sun, Jan 25, 2015 at 10:33:34AM -0300, Ciro Iriarte wrote:
> Also, the test traffic was stopped, so the trace file should be complete
> and cleaner!.


I don't see anything that is wrong here. From a cold cache, it takes 11
queries to resolve 2.centos.pool.ntp.org.

Your network used up the following amounts of time on those queries:
 in 266ms
 in 226ms
 in 184ms
 in 226ms
 in 233ms
 in 267ms
 in 223ms
 in 201ms
 in 224ms
 in 51ms
 in 199ms

Which together is around 2 seconds. 

If there is a problem, the problem is that your network is pretty far away
from most servers it appears. 

If you redo your query with the latest PowerDNS test version (3.7.0-RC1)
you'll get slightly better timing output with --trace, which perhaps could
tell you a little more.

On a high-latency network (and your fastest response to anything in this
trace was 51ms, even if I look at the other queries too), having a warm
cache is super important.

Good luck!


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