Can somebody explain me why the recursor cache size and latency are
correlated and directly proportional?
This is my dns graph.
http://ns2.w3media.net/recursor/
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
milliseconds"
It when it reaches 120-130 ms it really affects recursor performance.

Eugene 



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