Hi, On 2/15/19 5:39 PM, Nico wrote: > If it helps, at the same time the metrics for "cache deferred lookups > per poool" and "cache deferred > inserts per pool" incremented proportionally.
I think you have your answer right there, the contention between thread is too high and by default dnsdist gives up if the cache is already locked by another thread when it tries to access it. I would suggest increasing the number of shards to a sensible value (try 50 for a start, for example), see the 'numberOfShards' parameter of newPacketCache() [1]. You could also try to instruct dnsdist to wait for the lock when it is trying to insert a new response, instead of giving up, setting 'deferrableInsertLock' to false. But I'm pretty sure you won't need it with enough shards. [1]: https://dnsdist.org/reference/config.html#newPacketCache Best regards, -- Remi Gacogne PowerDNS.COM BV - https://www.powerdns.com/
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