Strange recursor response time pattern

[Matus UHLAR - fantomas]

On 05.09.17 16:44, Havard Eidnes wrote:
>It seems that every 10s, "on the clock", BIND will temporarily
>increase the query response time rather drastically for a short while,
>only to settle down to normal behaviour until the next 10s event.

>Any idea what might be causing this?  Anything I can do to remedy
>the behaviour?

BIND keeps track of servers it's sending queries to and their RTTs to prefer
sending queries to servers that respond more quickly.

ocasionally, it re-sends queries even to slower or unreachable servers to
see if the situation changed.

what you see may be result of this algorithm.
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