[dnsdist] [EXT] Re: Unexpected not-caching behavior in 1.5.0-rc3

Remi Gacogne remi.gacogne at powerdns.com
Fri Jul 3 09:01:01 UTC 2020

On 7/2/20 7:10 PM, Phillip R. Jaenke wrote:
> EDNS0 was the first thing I eliminated, in fact.. the whole thing looks
> literally like this (the lookups changing but you get the concept):
> rs=1
> while [ $rs -le 100 ]; do
>     for xs in a b c d e f g h i j k l m; do
>         dig -t A $xs.root-servers.net @${1} +short +nocookie +noedns
>         dig -t AAAA $xs.root-servers.net @${1} +short +nocookie +noedns
>     done
> done
> So it does exactly what it says on the tin there. Looks up the same 26
> records, 2600 times in total, from the same host (so EDNS shouldn't be
> varying regardless, but, eliminate the knobs.) It's purely a cache test.

That exact test seems to work correctly on master (except rs is not
incremented so you have to stop it manually at some point):

> getPool("localroot"):getCache():printStats()
Entries: 26/1024
Hits: 6102
Misses: 26
Deferred inserts: 0
Deferred lookups: 0
Lookup Collisions: 0
Insert Collisions: 0
TTL Too Shorts: 0

Best regards,
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/

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