[dnsdist] Performance drop (cache hits) after changing configuration

Allan Willems Joergensen allan at nowhere.dk
Thu Sep 25 14:24:18 UTC 2025


Hi,

Thanks for the pointer, seeing as the backend support proxy protocol, 
disabling use_client_subnet seem like the most straight forward fix.


-- 
Med venlig hilsten/kind regards
Allan Willems Joergensen -https://nowhere.dk

On 25.09.2025 13.01, Remi Gacogne via dnsdist wrote:
> Hi Winfried,
>
> On 9/25/25 12:58, Winfried via dnsdist wrote:
>> I'm not sure, but maybe "use_client_subnet: true" in the new 
>> configuration is the reason why the queries are not cached if the 
>> cache is not ECS aware.
> That's a strong possibility indeed. The zero-scope feature might 
> mitigate the impact if and only if the backend is cooperating: 
> https://www.dnsdist.org/advanced/zero-scope.html
>
>
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