[Pdns-users] Latency and cache size are correlated
bert.hubert at netherlabs.nl
Wed Apr 30 11:56:27 UTC 2008
On Tue, Apr 29, 2008 at 05:17:57PM -0700, Eugene Pefti wrote:
> Can somebody explain me why the recursor cache size and latency are
> correlated and directly proportional?
> This is my dns graph.
> Whenever the cache grows up to 30K entries the latency reaches as high as
> 120 ms. See the second graph called "Questions/Answers latency in
You have so little questions (10/second) that the statistics are not very
good, and will be dominated by single queries that time out.
> It when it reaches 120-130 ms it really affects recursor performance.
If you see performance issues, please try
contains an important fix for a timeout problem.
Also, have you managed to look at the questions I sent you earlier?
http://www.PowerDNS.com Open source, database driven DNS Software
http://netherlabs.nl Open and Closed source services
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